Equipment list operational and

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OPERATIONAL PROCEDURES
MAINTENANCE PROCEDURES (To prevent service air flow to the Cabin Door Primary Seal)

SYSTEM & SEQUENCE NUMBERS

REMARKS OR EXCEPTIONS

21 AIR CONDITIONING (Continued)
3. Emergency Pressurization Solenoid Valve

4. Windshield Anti-Ice Flow Control and Shutoff

(O) May be inoperative provided:

a) The Emergency Pressurization Solenoid Valve is verified closed, and

b) Flight is conducted unpressurized.

OPERATIONAL PROCEDURES
1. Move the airplane to a suitable run-up area.

2. Set parking brake.

3. Start one engine and adjust power to 75% N1.

4. Open Windshield Manual Control Valves.

CAUTION: LIMIT GROUND OPERATION OF THE WINDSHIELD BLEED AIR SYSTEM TO FIVE SECONDS.
5. Briefly position Windshield Anti-Ice Bleed Air switch to LOW.

6. Verify audible airflow to Windshield Bleed Air Nozzles.

7. Close Windshield Manual Control Valves.

8. Verify no audible air flow from Windshield Nozzles and Cockpit Air Distribution Ducts.

9. Position Windshield Anti-Ice Bleed Air switch to OFF.
NOTE: It may be necessary to slightly open and close the manual valves after the anti-ice switch is turned OFF to prevent W/S AIR O’HEAT annunciation.
10. Shut down engine.

11. Place a placard adjacent to the Air Source Select switch stating: “EMER PRESS INOP.”

12. Make appropriate entry on the discrepancy report.

(O) May be inoperative provided:

a) The windshield anti-ice flow control and shutoff valve is verified closed, and

b) The flight is not conducted into known or forecast icing conditions.

OPERATIONAL PROCEDURES
NOTE: Defog capabilities may not be sufficient when temperature/dew point spreads are less than 10C (5F).
NOTE: Emergency Pressurization will not be available, which affects the Cabin Decompression Emergency Checklist. Consistent with MMEL item 21-3, flight should be conducted unpressurized.
1. Set the parking brake and start both engines.

2. Open Windshield Bleed Air Manual Valves.

3. Ensure Windshield Bleed Air Anti-Ice switch is OFF.

4. Verify no audible airflow to Windshield Bleed Air Nozzles is present.

(Continued Next Page)

SYSTEM & SEQUENCE NUMBERS

REMARKS OR EXCEPTIONS

21 AIR CONDITIONING (Continued)
4. Windshield Anti-Ice Flow Control and Shutoff (Continued)

5. Cabin Differential Pressure Gauge

10. Cabin Door Primary Seal

5. Close both Windshield Bleed Air Manual Valves.

6. Verify the W/S AIR O’HEAT annunciator is not illuminated.

7. Shut down engines.

8. Place placard stating: “WINDSHIELD ANTI-ICE INOP” adjacent to the Windshield Bleed Air switch.

9. Make appropriate entry on the discrepancy report.

10. Flight will be conducted unpressurized.

(O) May be inoperative provided:

a) Cabin Altimeter is operating normally, and

b) Cabin Pressurization Auto Schedule is operating normally.

OPERATIONAL PROCEDURES

1. Verify upon turning the aircraft battery switch to ON, the absence of a red fault light and normal display indications exist on the Pressurization Controller.

NOTE: The absence of the red fault light and the presence of normal controller display indications verify the controller auto schedule is operational.
2. Place placard adjacent to the Cabin Pressure Differential Gauge stating: “Cabin Diff Press Gauge INOP.”

3. Make appropriate entry on the discrepancy report.

(M) May be inoperative provided:

a) Service Air System is operating normally,

b) Any leak of the service air is stopped,

c) Cabin Pressurization Source Selector switch remains in OFF or FRESH AIR,

d) Flight is conducted unpressurized, and

e) Crew and passengers comply with any applicable oxygen requirements.

MAINTENANCE PROCEDURES (To prevent service air flow to the Cabin Door Primary Seal)

1. Gain access to the service air line for the Cabin Door Primary Seal by removing the refreshment center (if installed) on the left side of the cabin immediately forward of the main cabin door.

2. Remove floor panel beneath refreshment center location.

3. Install one AN929-4D cap on the door seal line and one AN806-4D plug at the tee fitting which connects the service air supply line, cockpit diverter line and the door seal line.

NOTE: Ensure caps and plugs are installed on the

tee fitting side that leads to the door seal line only.

4. Install floor panel and refreshment center.

5. Place placard adjacent to the pressurization controller stating: “Primary Door Seal INOP.”

6. Make appropriate entry on the discrepancy report.

SYSTEM & SEQUENCE NUMBERS

REMARKS OR EXCEPTIONS

21 AIR CONDITIONING (Continued)
12. Pressurization Controller (Auto Schedule Mode)

13. Cabin Fans

14. Freon Air Conditioning System

(O) May be inoperative provided:

a) The Isobaric Mode is used and,

b) Manual mode is operating normally.

OPERATIONAL PROCEDURES
1. Verify cabin door is closed and locked prior to engine run.

2. Position the airplane in suitable engine run-up area.

3. Select Press System Select switch to AUTO.

4. Set parking brake. Start the right engine and maintain at idle thrust and select RH position on Air Source Select switch.

5. Position Avionics Power switch to ON.

6. Verify the Isobaric Mode is active by illumination of the amber light on the Pressurization Controller.

7. Select MANUAL position on the Temperature Select knob.

8. Disengage NORM PRESS circuit breaker on the left circuit breaker panel.

9. Select MANUAL position on Press System Select switch.

10. Using the MANUAL Toggle Valve, confirm operation of the manual system by driving the cabin altitude down approximately 1,000 feet below field elevation.

11. Return the cabin altitude to field elevation using the MANUAL Toggle Valve.

12. Rotate Air Source Select Switch to the OFF position.

13. Engage NORM PRESS circuit breaker and return the Temperature Select switch to AUTO and Press Select switch to AUTO position.

14. Verify that the airplane is not pressurized by observing the Cabin Pressure Differential Gauge.

15. Position AVIONICS POWER switch to OFF.

16. Shut down engines.

17. Place placard adjacent to Pressurization Controller stating: “Pressurization Auto Schedule Mode INOP.”

18. Make appropriate entry on the discrepancy report.

(M) May be inoperative provided the Freon Air Conditioning circuit breaker is pulled and collared.
MAINTENANCE PROCEDURES
1. AIR COND C/B – Pull and secure with tie-wrap.

2. Place a “CABIN FANS INOP” placard next to the air conditioner controls.

3. Make appropriate entry on the discrepancy report.

(M) May be inoperative provided:

a) Freon Air Conditioning System is deactivated, and

b) Cabin Temperature Control System is operating normally.

MAINTENANCE PROCEDURE

Access the right-hand junction box in the tailcone.
Remove the VCCS (HZ028) fuse limiter.

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