Aviation Maintenance Terms

AFM

Airplane flight manual.

---

APU

Auxiliary power unit.

---

CAMP

Continuous airworthiness maintenance program.

---

CAS

Calibrated airspeed.

---

CAT II

Category II.

---

CMP

Configuration, maintenance, and procedures.

---

DME

Distance measuring equipment compatible with TACAN.

---

EAS

Equivalent airspeed.

---

EWIS

As defined by§ 25.1701 of this chapter, electrical wiring interconnection system.

---

FAA

Federal Aviation Administration.

---

GS

Glide slope.

---

IAS

Indicated airspeed.

---

ICAO

International Civil Aviation Organization.

---

NDB (ADF)

Nondirectional beacon (automatic direction finder).

---

NM

Nautical mile.

---

OPSPECS

Operations specifications.

---

PMA

Parts manufacturer approval.

---

POC

Portable oxygen concentrator.

---

RNAV

Area navigation.

---

SATCOM

Satellite communications.

---

TACAN

Ultra-high frequency tactical air navigational aid.

---

TAS

True airspeed.

---

TCAS

A traffic alert and collision avoidance system.

---

TCAS I

A TCAS that utilizes interrogations of, and replies from, airborne radar beacon transponders and provides traffic advisories to the pilot.

---

TCAS II

A TCAS that utilizes interrogations of, and replies from airborne radar beacon transponders and provides traffic advisories and resolution advisories in the vertical plane.

---

TCAS III

A TCAS that utilizes interrogation of, and replies from, airborne radar beacon transponders and provides traffic advisories and resolution advisories in the vertical and horizontal planes to the pilot.

---

TSO

Technical standard order.

---

V1

The maximum speed in the takeoff at which the pilot must take the first action (e.g., apply brakes, reduce thrust, deploy speed brakes) to stop the airplane within the accelerate-stop distance. V1 also means the minimum speed in the takeoff, following a failure of the critical engine at VEF, at which the pilot can continue the takeoff and achieve the required height above the takeoff surface within the takeoff distance.

---

V2

Takeoff safety speed.

---

V2min

Minimum takeoff safety speed.

---

VA

Design maneuvering speed.

---

VB

Design speed for maximum gust intensity.

---

VC

Design cruising speed.

---

VD

Design diving speed.

---

VDF /MDF

Demonstrated flight diving speed.

---

VEF

The speed at which the critical engine is assumed to fail during takeoff.

---

VF

Design flap speed.

---

VFC /MFC

Maximum speed for stability characteristics.

---

VFE

Maximum flap extended speed.

---

VFTO

Final takeoff speed.

---

VH

Maximum speed in level flight with maximum continuous power.

---

VHF

Very high frequency.

---

VLE

Maximum landing gear extended speed.

---

VLO

Maximum landing gear operating speed.

---

VLOF

Lift-off speed.

---

VMC

Minimum control speed with the critical engine inoperative.

---

VMO /MMO

Maximum operating limit speed.

---

VMU

Minimum unstick speed.

---

VNE

Never-exceed speed.

---

VNO

Maximum structural cruising speed.

---

VOR

Very high frequency omnirange station.

---

VORTAC

Collocated VOR and TACAN.

---

VR

Rotation speed.

---

VREF

Reference landing speed.

---

VS0

The stalling speed or the minimum steady flight speed in the landing configuration.

---

VS1

The stalling speed or the minimum steady flight speed obtained in a specific configuration.

---

VSR

Reference stall speed.

---

VSR1

Reference stall speed in a specific configuration.

---

VSRO

Reference stall speed in the landing configuration.

---

VSW

Speed at which onset of natural or artificial stall warning occurs.

---

VTOSS

Takeoff safety speed for Category A rotorcraft.

---

VX

Speed for best angle of climb.

---

VY

Speed for best rate of climb.

---