APU Flashcards
1
Q
GENERAL
- Model –
- Max ops/start –
- Max altitude for engine start (starter assist) –
- Approved for unattended ops –
- Fuel supply –
- Provide electrical power to –
- Protective shutdown –
- Gen –
A
GENERAL
- Model – Garrett 36-150(CX)
- Max ops/start – 31,000 ft
- Max altitude for engine start (starter assist) – 25,000 ft
- Approved for unattended ops – No
- Fuel supply – LH Boost pump LH hopper
- Provide electrical power to – LH EMER Bus
- Protective shutdown – Yes
- Gen – 28 VDC/300AMP (200AMP in flight)
2
Q
FIRE PROTECTION
- Detection loop type –
- Dedicated/shared bottle –
- Monitored by –
- APU FIRE Auto shutdown –
- After CAS, delay before bottle activated –
- APU FIRE DETECT FAIL –
A
FIRE PROTECTION
- Detection loop type – Pressure sensitive fire loop
- Dedicated/shared bottle – Dedicated
- Monitored by – ECU
- APU FIRE Auto shutdown – Yes
- After CAS, delay before bottle activated – 8 secs
- APU FIRE DETECT FAIL – Auto Shutdown
3
Q
BLEED AIR
- Pressurisation
- Air Con
- Starting Eng
- Service Air
- Not connected to anti-ice
- Run APU 2 mins before switching bleed on
- Bleed off for start – spring loaded valve that may open during start sequence
A
BLEED AIR
- Pressurisation
- Air Con
- Starting Eng
- Service Air
- Not connected to anti-ice
- Run APU 2 mins before switching bleed on
- Bleed off for start – spring loaded valve that may open during start sequence
4
Q
FUEL
- On ground CENTRE TRANSFER Switch set to –
- To balance fuel on ground use –
A
FUEL
- On ground CENTRE TRANSFER Switch set to – OFF as L Boost Pump will activate transfer
- To balance fuel on ground use – CROSSFEED knob
5
Q
APU START
• When selector knob ON – o o o o
A
APU START
• When selector knob ON –
o Self-test
o APU Fire light briefly
o EIS Amber dashes EGT/RPM within 10 secs
o White FIRE BOTTLE LOW APU momentarily
6
Q
APU START
- Min batt temp for start –
- Min voltage for start –
- Start relay disengage –
- Start using (Bus) –
A
APU START
- Min batt temp for start – -18 degC
- Min voltage for start – 23V
- Start relay disengage – 50%
- Start using – L EMER BUS
7
Q
APU START
• Successful starts –
• Unsuccessful start
o Battery –
o Gen/GPU –
A
APU START
• Successful starts – 6 at 10 mins interval then 1 hour off
• Unsuccessful start
o Battery – 30 s X 2 / 30 m off / 30 s x 2 / 1 hr off
o Gen/GPU – 15 s X 2 / 20 m off / 15 s X 2 (max 4 / hour)
8
Q
LIMITATIONS - TURBINE SPEED
- Normal 100%
- Caution 101 to 108%
- Max 108%
A
LIMITATIONS - TURBINE SPEED
- Normal 100%
- Caution 101 to 108%
- Max 108%
9
Q
LIMITATIONS - EGT
- Max start - 973
- Max – 718
- Max Cont – 665
A
LIMITATIONS - EGT
- Max start - 973
- Max – 718
- Max Cont – 665
10
Q
LIMITATIONS
- Max ops/start –
- Speed for start 20k to 31k ft –
- Speed for start 8k to 20k ft –
- Speed for start <8k ft –
- De-ice fluid when APU is running –
- Start attempt after dual gen failure –
A
LIMITATIONS
- Max ops/start – 31,000 ft
- Speed for start 20k to 31k ft – 300 KIAS
- Speed for start 8k to 20k ft – 350 KIAS
- Speed for start <8k ft – 270 KIAS
- De-ice fluid when APU is running – No
- Start attempt after dual gen failure – 1
