GPWS & TCAS Flashcards
What are the GPWS mode 4 call-outs
Too low terrain
Too low gear
Too low flaps
List the standard GPWS mode 6 call-outs
2500, 1000, 500, 100, 50, 40, 30, 20, 10, MINIMUMS
– BANK ANGLE 10° at 30’, 40° at 1500’
– WINDSHEAR has priority
What overrides GPWS Warnings? What other alerts do GPWS alerts override
When a performance decreasing wind shear is detected (See AFCAS), three times the words “WINDSHEAR” is produced. This alert has priority over other ground proximity warnings.
Flap override
Glide Slope inhibit.
What is the difference between EGPWS Terrain Clearance Floor and a EGPWS Runway Clearance Floor
he Terrain Clearance Floor (TCF) protects against possible premature descent during non-precision approaches regardless of air- craft configuration and is based on the cur- rent aircraft position, radio altitude and distance to the centre point of the nearest runway in the database.
The Runway Field Clearance Floor (RFCF) is similar to the TCF except that RFCF is based on the current aircraft position and height above the destination runway based on geometric altitude. The RFCF is active within 5 nm of the runway and provides improved protection at locations where the destination runway is significantly higher than the surrounding terrain.
What does the Terrain Awareness Display indicate during an EGPWS CAUTION and WARNING
Terrain above the current aircraft true altitude i s displayed in medium density red and/or yellow and terrain at and below the current aircraft true altitude in light density yellow and light and medium density green. Terrain penetrating the caution envelope i s displayed in high density yellow and terrain penetrating the warning envelope in high density red
How must the EFIS display be setup for the TAD to show terrain
The DISPLAY TERRAIN p/b at the GPWS/ TAWS controls enables display of terrain awareness information at the onside ND, pro- vided ARC or MAP mode is selected and the WX control knob at the respective EFIS con- trol panel is out of the OFF position.
Which GPWS warnings can be inhibited
– GPWS automatically inhibited when pre-stall
warning is active
– Flap Override switch
– Glide slope inhibit – below 1000’ RA
• Rearms when climbing through 1000’ or descending
through 30
TAWS P/b switch
When should TAWS be inhibited
All Aural TAWS cautions and warnings are inhibited when the pre-stall warning is active
What actions are required in the event of a GPWS “ CAUTION OBSTACLE “ alert
Obstacles that penetrate the caution enve- lope will cause an aural caution ”CAUTION OBSTACLE”, CAUTION OBSTACLE” and, if no flight path correction follows, the aural warning ”OBSTACLE, OBSTACLE, PULL UP” including illumination of the GPWS lights. The aural message “PULL UP” is repeated as long as the aircraft is within the warning envelope. Cautions are given 40-60 seconds ahead of the terrain/obstacle conflict and warnings approximately 30 seconds prior to the ter- rain/obstacle conflict. TAKE IMMEDIATE ACTION
Describe the GPWS system test
System test may be performed when on the ground: On both EFIS control panels select ARC or MAP mode. Weather control know out of off position.
Press the GPWS test p/b at the test panel.
During test the self test is displayed on the ND for approximately 10 secs
What is the maximum range at which TCAS traffic is normally detected
The surveillance range is approx 40 nm with a vertical range of 9900 ft above and below the aircraft
Under what circumstances will TCAS not issue a RA , regardless of the position of the other aircraft
Aural and visual RA’s are inhibited below 900 ft radio altitude during descent and below 1100 ft radio altitude during climb
Aural RA’s are inhibited in case of wind shear (if installed) or ground proximity warnings, (these warnings have priority over TCAS audio alerts), except by GPW mode 6.
How must the ND be configured to show TCAS traffic
RA and TA advisories will be displayed at the PFD. All detected traffic can be displayed on the ND when in the ROSE or the MAP mode. In the ROSE, MAP 15, or MAP 15B mode, a TCAS range ring is displayed at 3 nm. Functions of the traffic display at the ND are available via the EFIS control panel
When should TA only be selected
Engine-out operations - Non-normal configurations (e.g.: landing gear not retracted) - In a Precision Radar Monitored approach - Established on a heading to intercept final for parallel runway operations
Describe crew response to TA and RA
Flight Phase or Event Traffic Advisory • PF Guards AP, look out of aircraft and attempts visual contact •PNF Monitors the TCAS display and relays relative bearing and altitude
Resolution Advisory • PF Immediately: Disconnects AP Responds to RA cue Do not change FMP ALT • PNF Attempts visual contact with traffic and notifies ATC ‘TCAS RA’ (as soon as practical) and monitors PF
