AMS 2 Flashcards
What conditions are required for the engine bleed valves to be commanded open?
- Bleed switch is set to AUTO
- Respective engine bleed is available
- No fire is detected in the respective engine
- No bleed duct leak is detected
The APU Bleed valve is commanded open when the following conditions occur simultaneously?
- APU switch is set to AUTO
- APU Bleed is available
- No APU and left bleed duct leak
- Left engine bleed is unavailable
- Wing anti-ice system not requested (or wing anti-ice system requested ON and anti-ice system is failed)
The cross bleed is commanded open when the XBLEED button is pushed in (AUTO) and any of the following conditions is met?
When is the XBLEED commanded closed?
OPEN:
- One side provides manifold pressure and there is not a bleed air source on the opposite side
- Bleed APU button pushed out for main engine start
- Engine #2 start in the air
- APU bleed OFF and engine #1 start in the air
CLOSED:
- Bleed leak, unless starting an engine
- Engine FIRE EXTINGUISHER Handle pulled
- Manifold side with pressure above 90 PSI
When the airplane is on the ground and the APU is on, the AMS gives priority to APU bleed supply when all the following conditions are met
- The APU bleed and cross bleed push buttons are set to AUTO
- The APU bleed valve and the cross bleed valve are operating normally
- Ground speed is below 50kts and 30s have passed after Touchdown
- Either REF ECS is OFF and REF A/I is not ALL on the MCDU T/O DATA SET MENU page or the airplane is single engine taxiing
The AMS gives priority to the Engine supply bleeds when the following conditions are simultaneously met, with the engine and APU bleed available simultaneously
- Engine bleed is available
- The XBLEED valve is operating normally
- ENG REF ECS is selected ON
Both recirculation fans are commanded OFF when
- Both packs are commanded OFF
- During on ground, cabin warm-up mode with the APU as bleed source according to a function of ambient temperature and altitude
- Cargo bay fire signal activities
- DUMP button is pressed
- Smoke is detected in the recirculation bay
RECIRC FAN 1 is commanded OFF when
Is RECIRC FAN 2 turned off on a single pack operation?
- On ground, pack 1 is OFF and pack 2 is ON
- In Flight, IAS is greater than 50kts and pack 1 is OFF
RECIRC FAN 2 is never commanded off on a single pack condition
An ECS pack is OFF when its associated pack flow control valve (FCV) is closed. The ECS packs 1 and 2 are OFF if any of the following conditions occur:
- Bleed air source is NOT available for the pack
- Pack push button OFF
- Any engine is starting and there is a WOW (both packs OFF)
- the associated engine is starting, there is no WOW and the opposite engine is not starting
- Any engine is starting AND APU is the bleed source (both packs OFF)
- Associated bleed system duct leak
- Associated packs BIT shutdown failure are present
- Ram air valve BIT is running
The ECS OFF signal CLOSES the packs during T/O if any of the following conditions occur
ECS OFF signal CLOSES both packs during Go-around if any of the following conditions occur:
T/O
- One engine inoperative and APU bleed is not available
- Thrust levers are set to MAX position and APU bleed is not available
- T/O Dataset ECS OFF and APU bleed not available
- T/O Dataset ECS OFF and A/I set to ALL
Go-around
- One engine inoperative and APU bleed is not available up to 9700ft
- Thrust levers set to MAX position and APU bleed is not available
- Thrust levers set to MAX position and Wing A/I is ON
