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Terms/Definitions

Obstacle free zone (OFZ)

Obstacle free zone is the airspace above the inner approach surface, inner transitional surfaces, and balked landing surface and that portion of the strip bounded by these surfaces, which is not penetrated by any fixed obstacle other than a low-mass and frangible mounted one required for air navigation purposes.

Runway Incursion

Runway incursion is occurrence at an aerodrome involving the incorrect present of person, aircraft or vehicle  on the protected area of surface designated for the landing and takeoff of aircraft.

Preventive Maintenance

Preventive maintenance is programmed maintenance work done in order to prevent failure or degradation of facilities. Example: preventive maintenance of ALS preventive maintenance of navigation aids etc.

ABAS, GBAS and SBAS

Aircraft Based Augmentation System Ground Based Augmentation System Space Based Augmentation System ABAS GBAS SBAS It is an augmentation system that augments and/or integrates the information obtained from other GNSS elements with information available on board the aircraft. Example: RAIM – Receiver Autonomous Integrity Monitoring GBAS is primarily used for precision approach operations. It is

Phonetic Alphabets and Numbers

  A AL FAH K KEY LOH U YOU NEE FORM 4 FOW ER B BRAH VOH L LEE MAH V VIK TAH 5 FIFE C CHAR LEE M MIKE W WISS KEY 6 SIX D DELL TAH N NO VEM BER X ECKS RAY 7 SEV EN E ECK OH O OSS CAH Y

RNPC – Required Navigation Performance Capability

FANS – Future Air Navigation Systems defined RNPC (Required Navigation Performance Capability) as a parameter describing lateral deviations from assigned or selected track as well as along track position fixing accuracy on the basis of an appropriate containment level. In 1990 capability and performance were distinctly identified and RNPC was changed to RNP(Required Navigation Performance).

Radius to Fix (RF)

Radius to Fix (RF) leg is defined as constant radius circular path around a defined turn center that terminates at a fix. This leg may have speed limits applicable to prevent overshoot or undershoot of aircraft. RNP Scalability Part 4: PBN – RNP APCH, RNP AR APCH, RNP AR DP and A-RNP  

RNP Scalability

Scalability with respect to RNP refers to the ability of avionics systems to automatically retrieve and display the required RNP value for each leg segment of a route or procedure from navigation database. These RNP values are depicted on PFD or ND and CDI is scaled according to value of current leg. RNP scalability is

Limitation Codes – TLC codes & OCTOPUS codes

Nature of takeoff weight limitation is always indicated in takeoff charts (RTOW charts). Following is the list of codes assigned to different limitations. Limitations Codes TLC codes A300/A310/A320 OCTOPUS codes A320/A330/A340 Codes Nature Codes Nature 1 Structural weight 1 1st segment 2 1st or 2nd segment 2 2nd segment 3 Runway – OEI 3 Runway

Surface Incident

Surface incident is defined as unauthorized or un-approved movement within designated movement or an occurrence in that same are associated with operation of an aircraft that affects or could affect the safety of flight. This don’t not qualify as Runway Incursion.