RAD 16 – Ground Proximity Warning (GPWS) – LMS

📄 Detailed Notes ⚡ Cheat Sheet

Results

📄 Notes ⚡ Cheat Sheet

Q1. Which of the following are inputs to the central processing unit of the GPWS? i. Flaps ii. Landing gear iii. Glide slope iv. Unusual attitudes v. Radio altimeter vi. VOR

i ii vi

i ii iii v

i ii iv v

i ii iii v vi

[i, ii, iii, v] –

Step 1: GPWS requires specific flight parameters to monitor safety boundaries.

Step 2: Standard inputs include Radio Altimeter (v), Air Data (Vertical Speed/Mach), ILS Glide Slope (iii), Landing Gear position (ii), and Flap position (i).

Step 3: VOR and Unusual Attitudes are not primary GPWS CPU inputs.

Q2. GPWS can indicate: 1. Excessive bank angle. 2. Excessive terrain closure rate. 3. Excessive sink rate after lift-off. 4. Excessive glide slope deviations. 5. Too close to ground when not in landing configuration. 6. Excessive rate of descent. 7. Altitude call-outs.

2, 3, 4, 5, 6, 7.

1, 2, 3, 5, 6, 7.

All of the above.

1, 4, 5, 6, 7.

[All of the above] –

Step 1: Identify standard GPWS Modes 1 through 7.

Step 2: Mode 1 (Descent), 2 (Closure), 3 (Sink after T/O), 4 (Config), 5 (G/S), 6 (Call-outs/Bank angle).

Step 3: All listed items correspond to these established warning modes.

Q3. Mode 4 gives warning of:

excessive descent rate

excessive terrain closure rate

height loss after take-off/missed approach

unsafe terrain clearance when not in the landing configuration

[unsafe terrain clearance when not in the landing configuration] –

Step 1: Identify the function of GPWS Mode 4.

Step 2: Mode 4 is specifically designed to alert the crew when the aircraft is too close to the ground while not in the proper landing configuration (gear or flaps up).

Q4. EGPWS may indicate: 1. Excessive sink rate after T/O 2. Excessive descent rate 3. Excessive closure 4. Ground proximity, not in the landing configuration 5. Deviation from glide-slope 6. Proximity to en-route terrain

1, 4 & 6

2, 3 & 5

1, 3 & 5

2, 4 & 6

[1, 4 & 6] –

Step 1: Compare standard GPWS with Enhanced GPWS (EGPWS).

Step 2: EGPWS adds a terrain database for look-ahead capability (en-route terrain).

Step 3: While EGPWS includes all standard modes, the options provided require selecting the most appropriate grouping; 1, 4, and 6 are all valid indicators.

Q5. If an aircraft GPWS detects an excessive rate of descent with gear and flaps up, the alert and warning will be:

TERRAIN TERRAIN followed by 'WHOOP WHOOP PULL UP

SINK RATE followed by 'WHOOP WHOOP PULL UP

TOO LOW TERRAIN, TOO LOW TERRAIN followed by TOO LOW GEAR, TOO LOW GEAR

DON'T SINK, DON'T SINK

[SINK RATE followed by ‘WHOOP WHOOP PULL UP] –

Step 1: Identify the Mode triggered by excessive rate of descent.

Step 2: Mode 1 triggers for excessive sink rate regardless of configuration.

Step 3: The standard aural sequence for Mode 1 is “SINK RATE” followed by “WHOOP WHOOP PULL UP” if the condition persists.

Q6. GPWS must provide?

Visual warnings.

Aural warnings which may be supplemented by visual warnings.

Visual and aural warnings, which may be supplemented by tactile warnings.

Aural and visual warnings.

[Aural warnings which may be supplemented by visual warnings.] –

Step 1: Review regulatory requirements for GPWS outputs.

Step 2: The primary requirement for GPWS is aural alerts to ensure immediate pilot awareness.

Step 3: These are typically supplemented by visual lights (e.g., PULL UP) on the flight deck.

Q7. GPWS mode one gives warning of:

height loss after take-off/missed approach

excessive descent rate

unsafe terrain clearance when not in the landing configuration

excessive terrain closure rate

[excessive descent rate] –

Step 1: Define GPWS Mode 1.

Step 2: Mode 1 is specifically dedicated to monitoring the barometric rate of descent relative to terrain.

Step 3: It provides alerts for “excessive descent rate.”

Q8. The GPWS uses inputs from:

the radio altimeter, the ILS receiver, the Air Data Computers and the landing gear position indicators

the radio altimeter, the Air Data Computers, the ILS receiver, the landing gear position indicators and the flap position indicators

the radio altimeter, the Air Data Computers, the landing gear position indicators and the flap position indicators

the radio altimeter and the ILS receiver

[the radio altimeter, the Air Data Computers, the ILS receiver, the landing gear position indicators and the flap position indicators] –

Step 1: Identify all necessary sensors for GPWS modes.

Step 2: Requires height (Rad Alt), Speed/Rate (ADC), Glideslope (ILS), and Configuration (Gear/Flaps).

Step 3: Option 2 is the most comprehensive and correct list.

Q9. Which of the following are modes of the GPWS? 1. Excessive sink rate. 2. Altitude loss after T/O or go-around. 3. Excessive Glide slope deviation. 4. High climb rate. 5. Flaps in incorrect position. 6. High altitude descent. 7. Stall.

1, 2, 3, & 5

1, 3, 5 & 7

1, 2 & 3

All 7

[1, 2, 3, & 5] –

Step 1: Verify the 7 standard modes.

Step 2: 1 (Sink rate), 2 (Closure), 3 (Alt loss after T/O), 4 (Unsafe config), 5 (G/S), 6 (Callouts), 7 (Windshear – in newer systems).

Step 3: Items 4, 6, and 7 (as listed) are not standard original GPWS modes.

Q10. GPWS, mode three gives warning of:

height loss after take-off/missed approach

excessive descent rate

excessive terrain closure rate

unsafe terrain clearance when not in the landing configuration

[height loss after take-off/missed approach] –

Step 1: Define GPWS Mode 3.

Step 2: Mode 3 monitors for significant altitude loss during the initial climb phase after takeoff or a go-around while the gear and flaps are not in landing configuration.

Q11. The Ground Proximity Warning mode 5 provides a visual and audible warning to the pilot if the aircraft:

descends below 200 ft radio altitude with flaps retracted

is below 1000 ft radio altitude and more than 1.3 dots below the ILS glide path

descends below 500 ft radio altitude with gear retracted

sinks more than approximately 10% of accumulated altitude

[is below 1000 ft radio altitude and more than 1.3 dots below the ILS glide path] –

Step 1: Define GPWS Mode 5.

Step 2: Mode 5 is the “Below Glide Slope” alert.

Step 3: It activates when the aircraft is below 1000 ft AGL and deviates more than 1.3 dots below the ILS glide path.

Q12. If the sink rate is excessive the GPWS indication will be?

Too low, Too low. Whoop, Whoop, Pull up.

Sink rate, Whoop, Whoop, Pull up.

Don't sink, Whoop, Whoop, Pull up.

Too low gear. Too low gear. Whoop, Whoop, Pull up, Pull up.

[Sink rate, Whoop, Whoop, Pull up.] –

Step 1: Identify the Mode for excessive sink rate (Mode 1).

Step 2: Determine the aural alert sequence.

Step 3: The alert is “SINK RATE” (caution) followed by “WHOOP WHOOP PULL UP” (warning).

Q13. GPWS, mode operates between:

50 ft and 700 ft AGL

50 ft and 2450 ft AGL

50 ft and 1800 ft AGL

50 ft and 500 ft AGL

[50 ft and 2450 ft AGL] –

Step 1: Determine the operational range of the GPWS based on Radio Altimeter inputs.

Step 2: GPWS typically functions from 50 ft up to a maximum of 2450 ft or 2500 ft AGL.

Q14. The GPWS mode 3 audible alert is?

Repeated "Don't sink, Don't sink".

Repeated "Sink rate. Sink rate. Whoop, Whoop".

Repeated "Whoop, Whoop, Don't sink, Don't sink'

Repeated "Pull up, Pull up".

[Repeated “Don’t sink, Don’t sink”.] –

Step 1: Identify the Mode 3 aural alert.

Step 2: Mode 3 (altitude loss after takeoff) uses the specific phrase “DON’T SINK”.

Step 3: This message repeats until the condition is corrected.

Q15. An aircraft ‘goes around’ after descending to a radio alt of 190 feet. As power is applied a power unit is lost and some height is lost. The GPWS would provide an alert when the aircraft had lost about:

10 feet

20 feet

50 feet

100 feet

Q16. If sink rate is excessive the GPWS indication will be?

Too low, Too low. Whoop, Whoop, Pull up.

Too low gear. Too low gear. Whoop, Whoop, Pull up, Pull up.

Don't sink, Whoop, Whoop, Pull up.

Sink rate, Whoop, Whoop, Pull up.

Q17. The GPWS would provide visual and audible warning to a pilot if the aircraft descended:

to below 500’ radio altitude with flaps not in the landing position and speed below Mach .28

to below 500’ radio altitude with flaps not in the landing position and speed below Mach .35

to below 200’ barometric altitude with flap not in the landing position and speed below Mach .28

to below 200’ radio altitude with flap not in the landing position and speed below Mach .28

Q18. With reference to GPWS:

In all six modes the audible alerts and warnings are accompanied by the red flashing PULL-UP light

Mode 4A activates when the aircraft descends below 500 ft radio altitude at a speed less than Mach .35 with the landing gear retracted

Mode 4A activates when the aircraft descends below 500 ft barometric altitude at a speed less than Mach .28 with the landing gear retracted

Mode 6 re-arms when the aircraft leaves the hard alerting area

Q19. The GPWS the alert/warning information is provided by a radio altimeter with:

a downward transmitting beam whose dimensions are in the order of 60 and 30 in the fore/aft and the athwartship axes

a downward transmitting beam whose dimensions are in the order of 30 and 60 in the fore/aft and the athwartship axes

a forward transmitting beam

a downwards transmitting radio beam

Q20. At what radio altitude is Mode 4 armed?

500 ft

700 ft

200 ft

790 ft

Q21. GPWS mode 3 will operate if altitude loss occurs before you have acquired:

700 ft barometric altitude gain

500 ft terrain clearance

200 ft barometric altitude gain

700 ft terrain clearance

Q22. GPWS, mode two operates between:

50 ft and 2450 ft AGL

50 ft and 1800 ft AGL

50 ft and 700 ft AGL

50 ft and 500 ft AGL

Q23. The Ground Proximity Warning mode 4A provides a visual and audible warning ‘Too Low Gear’ to the pilot if the aircraft descends below _ _ _ _ _ _ with landing gear retracted.

200 feet radio altitude with speed below M 0.28

200 feet barometric altitude with speed below M 0.28

500 feet radio altitude with speed below M 0.35

500 feet barometric altitude with speed below M 0.35

Q24. Which of the following are GPWS modes? 1. Approaching stall. 2. Excessive glide slope deviation. 3. Excessive ROC. 4. Excessive ROD. 5. Incorrect flap position. 6. Sinking after lift-off and during go-around. 7. High altitude descent.

1, 2, 3, 5.

2, 4, 5, 6.

4, 5, 6, 7.

3, 4, 6.

Q25. GPWS can indicate? 1. Excessive bank angle. 2. Excessive terrain closure rate. 3. Excessive sink rate after lift-off. 4. Excessive glide slope deviations. 5. Too close to ground when not in landing configuration. 6. Excessive rate of descent. 7. Altitude call-outs.

All of the above.

1, 2, 3, 5, 6, 7.

2, 3, 4, 5, 6, 7.

1, 4, 5, 6, 7.

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Results

Q1. Which of the following are inputs to the central processing unit of the GPWS? i. Flaps ii. Landing gear iii. Glide slope iv. Unusual attitudes v. Radio altimeter vi. VOR

Q2. GPWS can indicate: 1. Excessive bank angle. 2. Excessive terrain closure rate. 3. Excessive sink rate after lift-off. 4. Excessive glide slope deviations. 5. Too close to ground when not in landing configuration. 6. Excessive rate of descent. 7. Altitude call-outs.

Q3. Mode 4 gives warning of:

Q4. EGPWS may indicate: 1. Excessive sink rate after T/O 2. Excessive descent rate 3. Excessive closure 4. Ground proximity, not in the landing configuration 5. Deviation from glide-slope 6. Proximity to en-route terrain

Q5. If an aircraft GPWS detects an excessive rate of descent with gear and flaps up, the alert and warning will be:

Q6. GPWS must provide?

Q7. GPWS mode one gives warning of:

Q8. The GPWS uses inputs from:

Q9. Which of the following are modes of the GPWS? 1. Excessive sink rate. 2. Altitude loss after T/O or go-around. 3. Excessive Glide slope deviation. 4. High climb rate. 5. Flaps in incorrect position. 6. High altitude descent. 7. Stall.

Q10. GPWS, mode three gives warning of:

Q11. The Ground Proximity Warning mode 5 provides a visual and audible warning to the pilot if the aircraft:

Q12. If the sink rate is excessive the GPWS indication will be?

Q13. GPWS, mode operates between:

Q14. The GPWS mode 3 audible alert is?

Q15. An aircraft ‘goes around’ after descending to a radio alt of 190 feet. As power is applied a power unit is lost and some height is lost. The GPWS would provide an alert when the aircraft had lost about:

Q16. If sink rate is excessive the GPWS indication will be?

Q17. The GPWS would provide visual and audible warning to a pilot if the aircraft descended:

Q18. With reference to GPWS:

Q19. The GPWS the alert/warning information is provided by a radio altimeter with:

Q20. At what radio altitude is Mode 4 armed?

Q21. GPWS mode 3 will operate if altitude loss occurs before you have acquired:

Q22. GPWS, mode two operates between:

Q23. The Ground Proximity Warning mode 4A provides a visual and audible warning ‘Too Low Gear’ to the pilot if the aircraft descends below _ _ _ _ _ _ with landing gear retracted.

Q24. Which of the following are GPWS modes? 1. Approaching stall. 2. Excessive glide slope deviation. 3. Excessive ROC. 4. Excessive ROD. 5. Incorrect flap position. 6. Sinking after lift-off and during go-around. 7. High altitude descent.

Q25. GPWS can indicate? 1. Excessive bank angle. 2. Excessive terrain closure rate. 3. Excessive sink rate after lift-off. 4. Excessive glide slope deviations. 5. Too close to ground when not in landing configuration. 6. Excessive rate of descent. 7. Altitude call-outs.

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