Oman CAA IR(H) flashcards

32 cards. Read the term and the definition here. The deck at the top of this page is optional.

QNH

Altimeter setting that makes the altimeter read elevation above mean sea level when the aircraft is on the ground at the reference point.

Decision altitude

The published altitude at which a missed approach must be initiated if the required visual reference is not established for the approach.

Standard separation minimum

In RVSM airspace at and above FL290, 1000 ft vertical separation applies between approved aircraft; below FL290, 1000 ft is typical.

Procedure design gradient

The minimum climb gradient assumed for departure obstacle clearance, normally 3.3 percent, about 200 ft per nautical mile.

Slant range error

DME measures line-of-sight distance to the station; at high altitude the indicated distance exceeds the actual ground distance.

Glideslope descent rate

A 3-degree glideslope requires about 300 ft per nautical mile; at 90 kt ground speed this is approximately 450 ft per minute.

Contingency fuel

Fuel carried in addition to trip fuel, typically 5 percent of trip fuel or 5 minutes holding, to cover unforeseen deviations.

Point of no return

The point along the route beyond which the aircraft cannot return to the departure aerodrome with the fuel remaining.

Cold temperature correction

At low temperatures, true altitude is lower than indicated altitude; procedure minima must be corrected to ensure obstacle clearance.

The leans

A somatogravic illusion in which a sudden acceleration or deceleration produces a false sensation of pitch, causing spatial disorientation.

Hypoxia threshold

Above 10,000 ft, unacclimatised crew require supplemental oxygen; above 13,000 ft, oxygen is required at all times in many States.

Blocked pitot tube

A blocked pitot tube causes the airspeed indicator to respond like an altimeter, showing increasing speed in a climb.

Settling with power

A vortex ring state with low airspeed, high descent rate and high power; recovery requires forward cyclic to gain airspeed.

Translational lift

Increased lift as airspeed moves the rotor out of its own downwash; effective translational lift occurs around 10 to 20 kt.

Lost communication squawk

The SSR code 7600 indicates radio failure; the crew follows the published lost-communication procedure for the route.

Clearance limit

The point to which an aircraft is cleared; if further clearance is not received, the aircraft must hold and request it.

RAIM

Receiver autonomous integrity monitoring detects satellite signal faults; a RAIM prediction is required before RNAV approaches without SBAS.

Drift angle

The angle between the aircraft's heading and its track over the ground, caused by the crosswind component.

Missed approach point

The point at which the missed approach must be initiated if the required visual reference is not established.

Final approach fix

The fix that marks the beginning of the final approach segment and the point from which final descent is normally started.

Read-back requirement

Route clearances, hold clearances, runway-in-use, altimeter settings and SSR codes must be read back to ATC.

QNE

The standard altimeter setting of 1013.2 hPa, used above the transition level and for flight levels.

Mountain wave

Lee-side wave activity producing severe turbulence, downdrafts and altimeter errors; lee downdrafts can exceed climb capability.

Sterile cockpit

A rule restricting non-essential conversation during taxi, take-off, approach and landing to reduce distraction and error.

Standby attitude indicator

An independent attitude reference used if the primary displays fail; it must be checked before flight.

Autorotation in IMC

Lowering collective and applying aft cyclic to maintain rotor RPM; the glide is flown at the published autorotation speed.

Retreating blade stall

A high-airspeed, high-load-factor condition producing vibration and pitch-up; avoided by observing VNE and load factor limits.

Alternate aerodrome minima

Weather at the alternate must be at or above published alternate minima at the estimated time of arrival for IFR planning.

Fuel monitoring

Comparing actual fuel consumption with planned consumption at each waypoint; a negative trend requires a diversion decision.

RNAV waypoint

A point defined by coordinates; the flight management system computes track, distance and ETA to each waypoint.

Great circle route

The shortest route between two points on the Earth's surface; rhumb line routes maintain constant track but are longer.

Squawk 7700

The SSR code indicating a general emergency; ATC is alerted and priority handling is provided.