European aviation safety agency

ICAO	International Civil Aviation Organization	MSL	Mean Sea Level
IFR	Instrument Flight rules	MSU	Mode Select Unit
IGN	Ignition	NAT MNPS	North Atlantic Minimum Performance Navigation Specification
ILS	Instrument Landing System	NAV	Navigation
INBD	Inboard	NAVAID	Navigation Aid
INHIB	Inhibit	ND	Navigation Display
INOP	Inoperative	NEF	Non-Essential Equipment and Furnishings
IRCM	InfraRed Counter Measure System	NICAD	Nickel Cadmium
IRS(s)	Inertial Reference System(s)	NLG	Nose Landing Gear
IRU	Inertial Reference Unit	NM	Nautical Mile(s)
ISDU	Inertial Sensor Display Unit	NOTAMS	Notice To Airmen
KHZ	kilohertz	NVG	Night Vision Goggles
LDG	Landing	NWS	Nose Wheel Steering
LED(s)	Light-Emitting Diode(s)	OAT	Outside Air Temperature
LNAV	Lateral Navigation	ORIDE	Override
LPV	Localizer Performance with Vertical guidance	OTBD	Outboard
LRCS	Long Range Communications System	OVERTEMP	Overtemperature
LSS	Lightning Sensor System	OVHD	Overhead
LVT	Linear Variable Transducer	OVHT	Overheat
MAX	Maximum	OVRD	Override
MDA	Minimum Descent Altitude	OXY	Oxygen
MEL	Minimum Equipment List	PA	Passenger Address
MIC(s)	Microphone(s)	PAX	Passenger
MISCMP	Miscomparison	PCMCIA	Personal Computer Memory Card International Association
MISCOMP	Miscomparison	PDA	Premature Descent Alert
MLS	Microwave Landing System	PDB	Power Distribution Box
MMEL	Master Minimum Equipment List	PDE	Protective Breathing Equipment
MNPS	Minimum Navigation Performance Specifications	PERF	Performance
MSA	Minimum Safe Altitude	PF	Pilot Flying
PFD(s)	Primary Flight Display(s)	STBY	Standby
PIC	Pilot In Command	STC	Supplemental Type Certificate
PM	Pilot Monitoring	SWLP	Standby Warning Lights Panel
PNF	Pilot Not Flying	SYM	Symbol
POP	Pilot’s Overhead Circuit Breaker Panel	SYS	System
PRNAV	Precision-Area Navigation	T/O	Takeoff
PSU	Personal Service Unit	T/O APP	Takeoff/Approach
PTT	Push-To-Talk	T/R	Thrust Reverser
PWR	Power	T/REV	Thrust Reverser
QRH	Quick Reference Handbook	TA	Traffic Alert
R	Right	TACAN	Tactical Air Navigation
RA	Resolution Advisory	TAS	True Airspeed
RAD ALT	Radio Altimeter	TAT	Total Air Temperature
RAAS	Runway Awareness & Advisory System	TAWS	Terrain Awareness and Warning System
REF	Reference	TCAS	Traffic Alert and Collision Avoidance
RMI	Radio Magnetic Indicator	TCS	Touch Control Steering
RNAV	Area Navigation	TEMP(s)	Temperature(s)
RNP	Required Navigation Performance	TGT	Turbine Gas Temperature
RPM	Revolutions Per Minute	THROT	Throttle
RT	Receiver-Transmitter	TO/GA	Takeoff/Go-Around
RTU	Radio Tuning Unit	TOGA	Takeoff/Go-Around
RVSM	Reduced Vertical Separation Minimum	TOGW	Takeoff Gross Weight
SATCOM	Satellite Communication	TR(s)	Thrust Reverser(s)
SATVOICE	Satellite Voice	TRU	Transformer-Rectifier Unit
SBAS	Satellite-Based Augmentation System	UHF	Ultra High Frequency
SEL	Select	V1	Takeoff Decision Speed (Knots)
SELCAL	Selective Calling	V2	Takeoff Safety Speed (Knots)
SG(s)	Symbol Generator(s)	VA	Maneuvering Speed (Knots)
SN	Serial Number	VFE	Maximum Flaps Extended Speed (Knots)
SOV(s)	Shutoff Valve(s)	VFR	Visual Flight Rules
SPDBRK	Speed Brake	VFS	Flight Safety Speed (Knots)

VHF	Very High Frequency
VLE	Maximum Landing Gear Extended (Knots)
VLO	Maximum Landing Gear Operation Speed (Knots)
VLV	Valve
VMC	Minimum Control Speed (Knots)
VMO	Maximum Operating Limit Speed (Knots)
VNAV	Vertical Navigation
VOL	Volume
VOR	Very High Frequency, Omni-Range
VR	Rotation Speed (Knots)
VREF	Reference Speed (Knots)
VS	Stall Speed (Knots)
WAAS	Wide Area Augmentation System
WHL	Wheel
WOW	Weight On Wheels
WSHLD	Windshield
WX	Weather
XM	Extended Module
YD	Yaw Damper

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SECTION ONE
LINE REPLACEABLE UNIT (LRU)

COMPONENT RELIEF

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1. Cabin Altitude Indication (Overhead Panel)	C	1	0	May be inoperative provided cabin altitude is available on EICAS Synoptic display.	None required.	None required.	An Inoperative Placard will be placed adjacent to Cabin Altitude Indicator and will be noted on ADLS.
	C	1	0	May be inoperative provided: a) Cabin Pressure Selector Panel is operative, and b) Pressurisation is operated in AUTO mode.	None required.	None required.	An Inoperative Placard will be placed adjacent to Cabin Altitude Indicator and will be noted on ADLS.
	C	1	0	(O) May be inoperative provided: a) Cabin Differential Pressure Indicator is operative, and b) A chart is provided to crew to convert Cabin Differential Pressure to Cabin Altitude.	None required.	Flight crew shall refer to the AOM Section 10-01-00, Figure 10.	An Inoperative Placard will be placed adjacent to Cabin Altitude Indicator and will be noted on ADLS.
(continued)	D	1	0	May be inoperative provided aeroplane is equipped with additional pneumatic three-in-one cabin pressurisation monitoring instrument, and Cabin Altitude Indicator portion is fully operative.	None required.	None required.	An Inoperative Placard will be placed adjacent to Cabin Altitude Indicator and will be noted on ADLS.

1. Cabin Altitude Indication (Overhead Panel) (cont’d)
	C	1	0	(O) May be inoperative provided aeroplane is operated in unpressurised configuration.	None required.	To operate the aeroplane unpressurised, select manual pressurisation and slew outflow valve to full open position with both engine bleeds and air conditioning packs selected ON if available. If not, select RAM Air ON. Monitor cabin differential pressure to be nominally zero psid during the flight. Refer to AFM Section 3-21-60: Unpressurized Flight. Flight crew will check that there is sufficient oxygen for the duration of the flight above 10,000 ft.	An Inoperative Placard will be placed adjacent to Cabin Altitude Indicator and will be noted on ADLS.

2. Cabin Differential Pressure Indication (Overhead Panel)	D	1	0	May be inoperative provided cabin differential pressure is available on EICAS Synoptic display.	None required.	None required.	An Inoperative Placard will be placed adjacent to Cabin Differential Pressure Indicator and will be noted on ADLS.
	C	1	0	May be inoperative provided: a) Cabin Pressure Selector Panel is operative, and b) Pressurisation is operated in AUTO mode.	None required.	None required.	An Inoperative Placard will be placed adjacent to Cabin Differential Pressure Indicator and will be noted on ADLS.
	D	1	0	(O) May be inoperative provided: a) Cabin Altitude Indicator is operative, and b) A chart is provided to crew to convert Cabin Altitude to Cabin Differential Pressure.	None required.	Flight crew shall refer to the AOM Section 10-01-00, Figure 10.	An Inoperative Placard will be placed adjacent to Cabin Differential Pressure Indicator and will be noted on ADLS.
(continued)	D	1	0	May be inoperative provided aeroplane is equipped with additional pneumatic three-in-one cabin pressurisation monitoring instrument, and Cabin Altitude Indicator portion is fully operative.	None required.	None required.	An Inoperative Placard will be placed adjacent to Cabin Differential Pressure Indicator and will be noted on ADLS.