Hawker 125 (Series 1 through 900XP)


-1 1 Thrust Reversing System (Series 700 and 800, If Installed, and 750, 800XP, 850XP and 900XP) 1



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30-1 1

Thrust Reversing System (Series 700 and 800, If Installed, and 750, 800XP, 850XP and 900XP) 1

30-2 1

Thrust Reverser Indicating Annunciators 1

78 - EXHAUST 2

For NORDAM (Dee Howard) Clamshell Thrust Reversers, perform the following steps: 2

For Aeronca Cascade Thrust Reversers, perform the following steps: 2

79 - ENGINE OIL 1

30-1 1

Oil Pressure Low Warning Lights/ Annunciators 1

80 – STARTING 1

00-1 1

Starter Power Available Annunciator (TFE-731 Engines Only) 1

00-2 1

Starter Select Light (Viper Engines Only) 1

00-3 1

Starter Operating Annunciators (TFE-731 Engines Only) 1




Maintenance and Operational Procedures
for Federal Aviation Administration Master Minimum Equipment List - Revision No: 8d – 12/12/13

1. SYSTEM,
Sequence Numbers & Item

Repair Category




2. Number Installed







3. Number Required for Dispatch

MAINTENANCE
PROCEDURES

OPERATIONAL
PROCEDURES

21 - Air Conditioning









4. Remarks and Exceptions

10-1

Engine Main Air Valves
C

2

1

(M) (O) One may be inoperative for pressurized flight provided;

  1. Valve is secured closed, and

  2. Flight Deck Heat Valve System is operative.

  1. Verify affected valve mechanical indicator arm is secured closed.

  2. Pull and collar the affected MAIN AIR VLV circuit breaker.

  3. Disconnect electrical connector from valve, bag, and stow.

With engines running, select AUX HEAT (F/DK VLV) and confirm that airflow is present.







C

2

0

(M) (O) May be inoperative provided:

  1. Both valves are secured closed,

  2. Ram Air and Dump Valve, or Vent Valve (Post Mod. 25G726A/C) are verified operative before the first flight of the day,

  3. DUMP VLV, or VENT VALVE (Post Mod. 25G726A/C) is selected OPEN,

  4. Flight is conducted in an unpressurized configuration,

  5. Aircraft is operated at or below 15,000 feet MSL, and

  6. Applicable Oxygen requirements are established and complied with.

  1. Visually confirm valve mechanical indicator arms are in the closed position.

  2. Pull and collar the affected MAIN AIR VLV circuit breaker.

  3. Disconnect electrical connectors from valves, bag, and stow.

Reference Table 1, Configure

Aircraft for Unpressurized Flight.

10-2

Engine Main Air Valve Position Indicators
C

2

1

(O) One may be inoperative provided both engine main air valves are operative.




With engines running and APU OFF,

  1. Sequentially select L & R Main Air Valves OPEN and CLOSED.

  2. Confirm that airflow is present with valve OPEN and that flow stops when valve is closed.







C

2

1

(O) One may be inoperative provided indicator associated with the operative main engine air valve is operative.




With engines running and APU OFF,

1. Select operative Main Air

Valve OPEN and CLOSED.

2. Confirm that airflow is present with valve OPEN, associated indicator illuminates while valve is OPEN, and that flow stops when valve is closed.







C

2

0

(M) (O) May be inoperative provided:

a) Both valves are secured closed,

b) Ram Air and Dump Valve, or Vent Valve (Post Mod. 25G726A/C) are verified operative before the first flight of the day,

c) DUMP VLV, or VENT VALVE (Post Mod. 25G726A/C) is selected OPEN,

d) Flight is conducted in an unpressurized configuration,

e) Aircraft is operated at or below 15,000 feet MSL, and

f) Applicable Oxygen requirements are established and complied with.


1. Visually confirm both valve mechanical indicator arms are in the closed position.

2. Pull and collar the affected

MAIN AIR VLV circuit breaker

3. Disconnect electrical connectors from both valves, bag, and stow.
Reference Table 1, Configure

Aircraft for Unpressurized Flight.

10-3

Refrigeration Unit System/ Air Cycle Machine
C

1

0

(O) May be inoperative provided:

  1. Ram Air and Dump Valve, or Vent Valve (Post Mod. 25G726A/C) are verified operative before the first flight of the day,

  2. Both MAIN AIR VALVES are selected CLOSED,

  3. DUMP, or VENT VALVE (Post Mod. 25G726A/C) is selected OPEN,

  4. Flight is conducted in an unpressurized configuration,

  5. Aircraft is operated at or below 15,000 feet MSL, and

  6. f) Applicable Oxygen requirements are established and complied with.




Reference Table 1, Configure

Aircraft for Unpressurized Flight.

10-4

Footwarmer and Windscreen Demister valve
C

1

0

May be inoperative provided windscreen heating system is operative.






10-5

***

Cockpit Ventilation Hawker (Excluding aircraft equipped with Collins Pro Line 21 Avionics)
C

-

0









10-6

Cabin Flood Valve


















1)

Two-Way Cabin Flood Valve (Aircraft without Cabin Floor Valves)

C

1

0










2)

Cabin Flood Valve (Aircraft with Cabin Floor Valves)

C

1

0

(O) May be inoperative provided Left Hand (LH) or Right Hand (RH) Cabin Floor Valve is verified operative.




With APU AIR ON or MAV open

(engines running)



  1. Select Cabin Floor Valve OPEN, and

  2. Confirm airflow from Cabin Floor Vent.







C

1

0

(O) May be inoperative provided:

  1. Ram Air and Dump Valve, or Vent Valve (Post Mod. 25G726A/C) are verified operative before the first flight of the day,

  2. DUMP VLV, or VENT VALVE (Post Mod. 25G726A/C) is selected OPEN,

  3. Flight is conducted in an unpressurized configuration,

  4. Aircraft is operated at or below 15,000 feet MSL, and

  5. Applicable Oxygen requirements are established and complied with.




Reference Table 1, Configure

Aircraft for Unpressurized Flight.

10-7

Ram Air Shut-Off Valve
C

1

0

(M) (O) May be inoperative for pressurized flight provided:

  1. Valve is secured fully closed, and

  2. Dump Valve, or Vent Valve (Post Mod. 25G726A/C) is operative.

  1. Locate RAM AIR VALVE circuit breaker on DA-A Panel.

  2. Pull and collar the RAM AIR VLV circuit breaker.

  3. Install INOP placard adjacent to shutoff valve lever.

  4. Operate Dump Valve, or Vent Valve (Post Mod. 25G726A/C) OPEN and CLOSED.

Operate Dump Valve, or Vent Valve (Post Mod. 25G726A/C) OPEN and CLOSED.

10-8

***

Rear Baggage Pannier Heating System
C

1

0

(M) May be inoperative provided:

  1. Inlet and outlet valves are verified closed, and

  2. Pannier heating is selected OFF.

NOTE
Refer to AMM 21-10-205 page 401.


  1. On panel DA-H, identify and remove F5 fuse.

  2. Locate Inlet Shut-off Valve.

  • Verify valve is closed by valve position indicator.

  1. Locate Outlet Shut-off Valve.

  • Verify valve is closed by valve position indicator.

  1. If either valve position indicator does not indicate CLOSED, valve(s) may be blanked.

  • Fabricate blanking plate to match 25-8VF405-1 gasket using 0.050” 2024-T3 Clad aluminum.

  • Install plate with two gaskets between valve and Pannier.


NOTE
Bolt length may need to be increased.


  1. Install INOP placard adjacent to PANNIER HEAT switch.



10-9

Refrigeration Unit Bypass Valve (RBV)









Moved to 21-60-7, Revision 5.






10-10

Overhead Air Flow Distribution Vents (Punkah Louvers)
D

-

0









10-11

Cabin Floor Valves
C

2

1
















C

2

0

(O) May be inoperative provided Cabin Flood Valve is verified operative.




With APU AIR ON or MAV open

(engines running),



  1. Select Cabin Flood Valve OPEN, and

  2. Confirm airflow from Cabin Flood Vent.







C

2

0

(O) May be inoperative provided:

  1. Ram Air and Dump Valve, or Vent valve (Post Mod. 25G726A/C) are verified operative before the first flight of the day,

  2. DUMP VLV or VENT VALVE (Post Mod. 25G726A/C) is selected OPEN,

  3. Flight is conducted in an unpressurized configuration,

  4. Aircraft is operated at or below 15,000 feet MSL, and

  5. Applicable Oxygen requirements are established and complied with.




Reference Table 1, Configure

Aircraft for Unpressurized Flight.

10-12

Cabin Flood Valve Indicator (Series 750, 800A, 800XP, 850XP and 900XP)
C

1

0

(O) May be inoperative provided:

  1. Cabin Flood Valve is verified operative, and

  2. Cabin Floor Valve Indicator is verified operative.




  1. Confirm Flood Valve control by cycling open and close, check audibly for change in flow.

  2. Open and close Floor Valves; confirm indicator for position change.







C

1

0

(O) May be inoperative provided:

  1. Ram Air and Dump Valve, or Vent valve (Post Mod. 25G726A/C) are verified operative before the first flight of the day,

  2. DUMP VLV or VENT VALVE (Post Mod. 25G726A/C) is selected OPEN,

  3. Flight is conducted in an unpressurized configuration,

  4. Aircraft is operated at or below 15,000 feet MSL, and

  5. Applicable Oxygen requirements are established and complied with.




Reference Table 1, Configure

Aircraft for Unpressurized Flight.

10-13

Cabin Floor Valve Indicator


C

1

0

(O) May be inoperative provided:

  1. Cabin Floor Valve is verified operative, and

  2. Cabin Flood Valve Indicator is verified operative.




With either APU or main engine air,

  1. Confirm operation of Cabin Floor Valve.

  2. Confirm Flood Valve operation and indication by listening for flow change and observing Flood Valve Indicator.







C

1

0

(O) May be inoperative provided:

  1. Ram Air and Dump Valve, or Vent valve (Post Mod. 25G726A/C) are verified operative before the first flight of the day,

  2. DUMP VLV or VENT VALVE (Post Mod. 25G726A/C) is selected OPEN,

  3. Flight is conducted in an unpressurized configuration,

  4. Aircraft is operated at or below 15,000 feet MSL, and

  5. Applicable Oxygen requirements are established and complied with.




Reference Table 1, Configure

Aircraft for Unpressurized Flight.

10-14

Flow Control Valve (Series 1 Through 800, except 750)
C

1

0

(O) May be inoperative provided:

  1. Ram Air Valve is verified operative prior to each departure,

  2. Dump Valve is selected OPEN,

  3. Flight is conducted in an unpressurized configuration,

  4. Aircraft is operated at or below 15,000 feet MSL, and

  5. Applicable Oxygen requirements are established and complied with.




Reference Table 1, Configure

Aircraft for Unpressurized Flight.

10-15

High Pressure (HP) Air Valve (With TFE-731 Engines Only)
C

2

1

(O) One may be inoperative provided:

a) Affected Main Air Valve is verified closed,

b) Cockpit auxiliary heating system verified operative, and

c) Flight is conducted at or below

FL 250.





  1. With the engines running and APU off,

  • Select Main Air Valve on affected side OPEN and CLOSED.

  • Confirm airflow is present with valve OPEN, associated indicator illuminates while valve is OPEN, and that flow stops when valve is closed.

  1. With engines running, select AUX HEAT and confirm that airflow is present.

  2. Conduct flight at or below FL 250.


NOTE
Special attention should be given to planning low altitude flights.







C

2

0

(O) May be inoperative provided:

  1. Both Main Air Valves are verified closed,

  2. Ram Air and Dump Valve, or Vent valve (Post Mod. 25G726A/C) are verified operative before the first flight of the day,

  3. DUMP VLV or VENT VALVE (Post Mod. 25G726A/C) is selected OPEN,

  4. Flight is conducted in an unpressurized configuration,

  5. Aircraft is operated at or below 15,000 feet MSL, and

  6. Applicable Oxygen requirements are established and complied with.




Reference Table 1, Configure

Aircraft for Unpressurized Flight.

10-16

Pressure Regulating Shutoff valve (PRSOV) (Series 800XP, 850XP, 900XP, C-29A, and 750)
C

1

0

(O) May be inoperative provided:

  1. Ram Air Valve is verified operative prior to each departure,

  2. DUMP VLV or VENT VALVE (Post Mod. 25G726A/C) is selected OPEN,

  3. RH Main Air Valve remains CLOSED,

  4. Flight is conducted in an unpressurized configuration,

  5. Aircraft is operated at or below 15,000 feet MSL, and

  6. Applicable Oxygen requirements are established and complied with.




Reference Table 1, Configure

Aircraft for Unpressurized Flight.

20-1

Cabin Recirculating Fan
C

1

0









20-2

Flight Deck Heat Valve/ Auxiliary Heating Valve
C

1

0

(O) May be inoperative closed provided flight is conducted at or below FL 250.




Operate at or below FL250.
NOTE
Special attention should be given to planning low altitude flights.

20-3

Flight Deck Recirculating Fan (s)
C

-

0









20-4

Mixing Valves (TFE 731 Engine Only)
C

2

1

One may be inoperative provided Main Air Valve is operated LP ON only.













C

2

0

(O) May be inoperative provided:

  1. Ram Air and Dump Valve, or Vent valve (Post Mod. 25G726A/C) are verified operative before the first flight of the day,

  2. DUMP VLV or VENT VALVE (Post Mod. 25G726A/C) is selected OPEN,

  3. Flight is conducted in an unpressurized configuration,

  4. Aircraft is operated at or below 15,000 feet MSL, and

  5. Applicable Oxygen requirements are established and complied with.




Reference Table 1, Configure

Aircraft for Unpressurized Flight.

21-1

Nose Compartment Ventilation System









Relocated to 34-70-12, revision 5.






30-1

Cabin Altitude Warning Light/ Annunciator
C

1

0

(O) May be inoperative provided:

  1. Cabin altimeter is operative, and

  2. Cabin altitude aural warning is operative.




1. Confirm that cabin altimeter is operative, and

2. Confirm that cabin altitude aural warning is operative.







C

1

0

(O) May be inoperative provided aircraft is operate at or below 10,000 feet MSL.




Operate at or below 10,000 feet

MSL.
NOTE


Special attention should be given to planning low altitude flights.

30-2

Cabin Altitude Aural Warning
C

1

0

(O) May be inoperative provided:

1. Cabin altimeter is operative, and

2. Cabin Altitude Warning Annunciator / light is operative.





1. Confirm that cabin altimeter is operative, and

2. Confirm that cabin altitude Warning Annunciator light is operative.







C

1

0

(O) May be inoperative provided aircraft is operated at or below 10,000 feet MSL.




Operate at or below 10,000 feet

MSL.
NOTE


Special attention should be given to planning low altitude flights.

30-3

Automatic Cabin Pressure Controller / DCPS AUTO Mode
C

1

0

(O) May be inoperative provided:

a) Manual pressure control system is operative,

b) Cabin altitude, Differential Pressure and Cabin Rate of Climb indicators are operative.





1. Confirm manual pressurization control is operative with cabin door closed and either engine or APU air ON:

• Select PRESSN OVRD on roof panel.

• Select Cabin Alt Control knob fully counterclockwise.

• Select Pressurization Control to GROUND TEST position.

• Operate Manual Cabin Altitude Control knob to increase and decrease cabin pressure.

• Return Pressurization Control to NORMAL and PRESSN AUTO.

2. Confirm normal operation of cabin altitude, differential pressure, and cabin rate of climb indications.







C

1

0

(O) May be inoperative provided:

  1. Ram Air and Dump Valve, or Vent valve (Post Mod. 25G726A/C) are verified operative before the first flight of the day,

  2. DUMP VLV or VENT VALVE (Post Mod. 25G726A/C) is selected OPEN,

  3. Flight is conducted in an unpressurized configuration,

  4. Aircraft is operated at or below 15,000 feet MSL, and

  5. Applicable Oxygen requirements are established and complied with.




Reference Table 1, Configure

Aircraft for Unpressurized Flight.

30-4

Fan Operated Venturi (excludes Digital Cabin Pressurization System)
C

1

0

(O) May be inoperative provided:

1. Dump Valve is verified operative, and

2. DUMP VLV is selected OPEN

for all ground operations, and

3. DUMP VLV is selected OPEN

for Takeoff and Landing



WARNING
Do not open the Main Entry Door before the aircraft cabin is depressurized.
Confirm cabin is depressurized before Main Entry Door is opened by either opening Cockpit C-Panel or selecting DUMP VLV fully OPEN.

30-5

Outflow / Safety Valves
C

2

0

(O) May be inoperative provided:

  1. Ram Air and Dump Valve, or Vent valve (Post Mod. 25G726A/C) are verified operative before the first flight of the day,

  2. DUMP VLV or VENT VALVE (Post Mod. 25G726A/C) is selected OPEN,

  3. Flight is conducted in an unpressurized configuration,

  4. Aircraft is operated at or below 15,000 feet MSL, and

  5. Applicable Oxygen requirements are established and complied with.




Reference Table 1, Configure

Aircraft for Unpressurized Flight.

30-6

Cabin Pressure Instruments (Triple Indicator or Separate Indicators)


















1)

Cabin Altitude Indicator

C

1

0

(O) May be inoperative provided:

  1. Cabin Differential Pressure Indicator is operative, and

  2. Cabin Rate of Climb Indicator is operative, and

  3. A chart is provided to the flight crew to convert cabin differential pressure to cabin altitude.

Reference Table 2, Aircraft Altitude

Versus Cabin Altitude.

  1. Confirm Cabin Differential Pressure Indicator is operative.

  2. Confirm Cabin Rate of Climb Indicator is operative, and

  3. Use a chart to convert cabin differential pressure to cabin altitude.







C

1

0

(O) May be inoperative provided:

  1. Ram Air and Dump Valve, or Vent valve (Post Mod. 25G726A/C) are verified operative before the first flight of the day,

  2. DUMP VLV or VENT VALVE (Post Mod. 25G726A/C) is selected OPEN,

  3. Flight is conducted in an unpressurized configuration,

  4. Aircraft is operated at or below 15,000 feet MSL, and

  5. Applicable Oxygen requirements are established and complied with.




Reference Table 1, Configure

Aircraft for Unpressurized Flight.

2)

Cabin Differential Pressure Indicator

C

1

0

(O) May be inoperative provided:

1. Cabin Altitude Indicator is operative, and

2. Cabin Rate of Climb Indicator is operative, and

3. A chart is provided to the flight crew to convert cabin altitude to cabin differential pressure.
Reference Table 2, Aircraft Altitude

Versus Cabin Altitude.

  1. Confirm that Cabin Altitude Indicator is operative.

  2. Confirm that Cabin Rate of Climb Indicator is operative, and

  3. Use a chart to convert cabin altitude to cabin differential pressure.







C

1

0

(O) May be inoperative provided:

  1. Ram Air and Dump Valve, or Vent valve (Post Mod. 25G726A/C) are verified operative before the first flight of the day,

  2. DUMP VLV or VENT VALVE (Post Mod. 25G726A/C) is selected OPEN,

  3. Flight is conducted in an unpressurized configuration,

  4. Aircraft is operated at or below 15,000 feet MSL, and

  5. Applicable Oxygen requirements are established and complied with.




Reference Table 1, Configure

Aircraft for Unpressurized Flight.

3)

Cabin Rate of Climb Indicator

C

1

0

(O) May be inoperative provided all remaining cabin pressure instruments and functions of the pressurization system are operative.




Confirm all remaining functions and instruments of the Cabin Pressurization System Instruments are operative.







C

1

0

(O) May be inoperative provided:

  1. Ram Air and Dump Valve, or Vent valve (Post Mod. 25G726A/C) are verified operative before the first flight of the day,

  2. DUMP VLV or VENT VALVE (Post Mod. 25G726A/C) is selected OPEN,

  3. Flight is conducted in an unpressurized configuration,

  4. Aircraft is operated at or below 15,000 feet MSL, and

  5. Applicable Oxygen requirements are established and complied with.




Reference Table 1, Configure

Aircraft for Unpressurized Flight.

30-7

Absolute Pressure Regulators (excludes Digital Cabin Pressurization System)
C

2

0

(O) May be inoperative provided:

  1. Ram Air and Dump Valves are verified operative before the first flight of the day,

  2. DUMP VLV is selected OPEN,

  3. Flight is conducted in an unpressurized configuration,

  4. Aircraft is operated at or below 15,000 feet MSL, and

  5. Applicable Oxygen requirements are established and complied with.




Reference Table 1, Configure

Aircraft for Unpressurized Flight.

30-8

Air Jet Pump
C

1

0

(O) May be inoperative provided:

  1. Ram Air and Dump Valve, or Vent valve (Post Mod. 25G726A/C) are verified operative before the first flight of the day,

  2. DUMP VLV or VENT VALVE (Post Mod. 25G726A/C) is selected OPEN,

  3. Flight is conducted in an unpressurized configuration,

  4. Aircraft is operated at or below 15,000 feet MSL, and

  5. Applicable Oxygen requirements are established and complied with..




Reference Table 1, Configure

Aircraft for Unpressurized Flight.

30-9

Flow Control Valve






Moved to 21-10-14, revision 5




50-1


***

Auxiliary Cooling Pack
C

-

0

(O) May be inoperative provided cabin ambient temperature remains suitable for equipment cooling.




Periodically confirm with passengers that cooling is suitable.

60-1

Temperature Control System





















1) Automatic

C

1

0

(O) May be inoperative provided the manual control system is operative.




With engines running, confirm that conditioned air temperature responds to manual temperature control changes.




2) Manual

C

1

0

(O) May be inoperative provided the automatic control system is operative.




With engines running, confirm that conditioned air temperature responds to automatic temperature control changes.

60-2

Cabin Temperature Indicator
C

1

0









60-3

Cabin Duct Temperature Indicator
C

1

0









60-4

Turbine Unit Bypass valve (Series 1 through 800) / Low Limit Temp Control Valve (Series 750, 800XP, 850XP & 900XP)
C

1

0

(O) May be inoperative provided:

  1. Ram Air and Dump Valve, or Vent valve (Post Mod. 25G726A/C) are verified operative before the first flight of the day,

  2. DUMP VLV or VENT VALVE (Post Mod. 25G726A/C) is selected OPEN,

  3. Flight is conducted in an unpressurized configuration,

  4. Aircraft is operated at or below 15,000 feet MSL, and

  5. Applicable Oxygen requirements are established and complied with.




Reference Table 1, Configure

Aircraft for Unpressurized Flight.

60-5

Cabin / VIP Temperature Control Switch
D

-

0

(O) May be inoperative provided temperature control system is operative from the cockpit.




With engines running, confirm that conditioned air temperature responds to temperature control changes.

60-6

Cabin Flood Control Valve / Flood Flow Valve









Renamed reformatted, and moved to 21-10-6, revision 5






60-7

Refrigeration Unit Bypass Valve (RBV) (Series1 through 800) /Cabin Temperature Control Valve (Series 750, 800XP, 850XP & 900XP)
C

1

0

(O) May be inoperative provided:

  1. Ram Air and Dump Valve, or Vent valve (Post Mod. 25G726A/C) are verified operative before the first flight of the day,

  2. DUMP VLV or VENT VALVE (Post Mod. 25G726A/C) is selected OPEN,

  3. Flight is conducted in an unpressurized configuration,

  4. Aircraft is operated at or below 15,000 feet MSL, and

  5. Applicable Oxygen requirements are established and complied with.




Reference Table 1, Configure

Aircraft for Unpressurized Flight.

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