APU

Question 1

GENERAL

• Model –
• Approved for unattended ops – YES/NO
• Fuel burn –
• Fuel feed –
• APU off and door closed for _____
• Generator – __ VDC / __ AMP
• Oil Quantity – __ US quarts

Answer 1

GENERAL

• Model – Honeywell GTCP36-150
• Approved for unattended ops – YES
• Fuel Burn – 100-120 lbs/hr
• Fuel feed – R STBY fuel pump or R engine driven pump
• APU off and door closed for deicing
• Generator – 28 VDC / 400AMP
• Oil Quantity – 2 US quarts

Question 2

ENVELOPE (LIMITATION)

• Max altitude for start –
• Max altitude for ops –
• Max altitude for bleed air –
• Max altitude for engine start –
• Bleed Off TO up to ____ft AGL, MPRSOV open and “BLEED CONFIG”

Answer 2

ENVELOPE (LIMITATION)

• Max altitude for start – 35,000ft
• Max altitude for ops – 40,000ft
• Max altitude for bleed air – 20,000ft
• Max altitude for engine start – 15,000ft
• Bleed Off TO up to 1,500ft AGL, MPRSOV open and “BLEED CONFIG”

Question 3

ESSENTIAL/NON-ESSENTIAL MODES

• Fire – shutdown for ________ mode/s, _______ activation of fire extinguisher
• Essential mode – WOW in ___ mode and until ___ mins after landing
• APU Essential CAS – fault detected which normally causes APU to _____ if not in Essential Mode
• APU STOP switch – trigger shutdown via ___ signal
• APU Bleed ON – LCV and Isolation valve ___

Answer 3

ESSENTIAL/NON-ESSENTIAL MODES

• Fire – shutdown for both essential and non-essential modes, manual activation of fire extinguisher
• Essential mode – WOW in air mode and until 15 mins after landing
• APU Essential CAS – fault detected which normally causes APU to shut down if not in Essential Mode
• APU STOP switch – trigger shutdown via overspeed signal
• APU Bleed ON – LCV and Isolation valve open

Question 4

APU MASTER

• BITE check
• APU inlet door opens
• APU Fuel shutoff valve opens
• Cyan CAS “APU Ready” after ___ secs

Answer 4

APU MASTER

• BITE check
• APU inlet door opens
• APU Fuel shutoff valve opens
• Cyan CAS “APU Ready” after 25 secs

Question 5

APU START

• Fuel – ___ RPM
• Starter drop out – ___ RPM
• Ignition drop out – ___ RPM
• Gen avail ___ RPM + ___ secs (shifts from starter motor to generator – reverse polarity)
• Bleed avail ___ RPM + ___ secs (temperature stabilises, fuel flow doubles)

Answer 5

APU START

• Fuel – 10% N1
• Starter drop out – 50% N1
• Ignition drop out – 95% N1
• Gen avail 95% RPM + 4 secs (shifts from starter motor to generator – reverse polarity)
• Bleed avail 95% RPM + 90 secs (temperature stabilises, fuel flow doubles)

Question 6

LIMITATION - START

• __ mins between shutdown and next start
• __ mins cooling after __ attempts

Answer 6

LIMITATION - START

• 2 mins between shutdown and next start
• 30 mins cooling after 3 attempts

Question 7

LIMITATION

• APU Gen load limit –
• Max rotor speed –

Answer 7

LIMITATION

• APU Gen load limit – 100%
• Max rotor speed – 108%

Question 8

LIMITATION - MAX EGT

• Start < 50% - ___
• Start 50% to 90% - ___ decreasing to ___ °C
• Running – ___ °C
• Bleed air in use – ___ °C

Answer 8

LIMITATION - MAX EGT

• Start < 50% - 974 °C
• Start 50% to 90% - 974 decreasing to 718 °C
• Running – 718 °C
• Bleed air in use – 666 °C

Question 9

LIMITATION

• Do not operate if Fire Bottle ___ activated
• ___ fuel pump or ___ engine driven pump to operate
• APU ___ and door ___ for deicing

Answer 9

LIMITATION

• Do not operate if Fire Bottle #2 activated
• R STBY fuel pump or R engine driven pump to operate
• APU off and door closed for deicing