Bleed Air Flashcards
Systems that use Bleed Air
- Eng Start
- Buddy Start
- A/C
- Cabin Press
- Leading-edge ice protection
Components
- BA\ECS
- X-Ship Manifold
- Bleed-Air Ducts
- Bleed-Air Compensators
- Bleed-Air Valves
- Mix-Muff assemblies
- Px Transducer
- Temp Sensor
Bleed-Air Aug
- on _____
- off _____
. On <1,000 hp
. Off >1,100 hp
Bleed-Air Stage
10th, augmented by 14th
Nacelle Auto Shutoff
. >101.5 psi
. >685° F
. Loss of electric power
. No Bleed-Air
What is lost when a wing is Isolated?
Same side leading edge anti-ice
What valves close to isolate a wing?
. Augmentor valves
. Nacelle SOVs
. isolation valve
Valves to ISO Left X-Ship
. Divider Valve
. LWing ISO Valve
. APU SOV
What is lost with ISO Left X-Ship?
Empennage Anti-Ice and De-Ice
Valves to ISO Right X-Ship
. Divider Valve
. RWing ISO Valve
What is lost with ISO Right X-Ship?
. Underfloor heat
. Cargo Comp A/C
Rate of Pressurization
Min: 0”/min
Max: 3,000”/min
Norm: +500”/min and -300”/min
Safety Valve
Opens: 14.96Hg or -0.76Hg
L or R X-Ship manifold between _______ and ______ Valves.
L or R ISO and Divider
“X-Wind limited” ACAWS
. 15 knot limit
ECS Systems
. Flight Statiion and Cargo Compartment A/C
. Underfloor Heat System
. Avionics Cooling System
A/C Components
. Heat Exchanger
. Turbine and Fan
. Water Seperator
Number of Avionics cooling fans
4
A/C Pack: Flow Control Valves Auto-Shutoff
- Water separator pressure differential of 14psi
- Flight Station A/C discharge >210° F
- Cargo Compartment A/C discharge >380° F
- Any Engine Start sw in Start.
A/C Flow Control Valve closed when
. Power Switched off
. Px Mode Select in AUX VENT
. Emergency Depressurization in DUMP
What temp is maintained for underfloor heat/fan
. 73°±8
. Shutoff if 210°
Default Spinner De-Ice operation
12” on, 78” off
De-Ice Sequence
- 6 min cycles alternating every minute
. Vertical - Horizontal - Vert - Out-board - Vert - In-Board
. Vert Boot inflates for 6” every 54”
Anti-Ice
- Same as De-Ice except Vert Tail is always receiving heat.
Wing/Empennage anti-ice only during _______ and ________ phases of flight.
Approach, Landing
Water Separator Temp and why
min 35° IOT prevent ice accumulation on separator bag.
What happens at 14 psid of water sep
. ACAWS Displayed
. A/C Shutdown
Range A/C will hold in Auto
60-90°
Avionics cooling fans on at ___°
41°f
When Px in Man, What indication do you look to, to set Cabin Px.
Cabin Rate. When at desired alt set 0 on Rate.
What should be monitored in High decent rates?
Differential Px. Forcing Safety Valve to open can cause damage.
Auto Ground mode
Outflow and safety valves open.
- WOW
- Power Levers < 33.1°
- Bleed air Pressurized
Pressurization
Auto Prep-Press mode
- Px Levers Flt Idle: Cabin alt descends <300’ below fld elevation.
- If abort: Cabin alt climbs 500fpm for 20”, then 2k fpm until depressurized.
Auto Climb mode
WoffW or Gear retracted IAS . 100kts, alt schedualed
Auto Cruise Mode
A/C remains ±200’ for 10min. Cabin alt maintained until >200’ for 10 or >500’.
Auto Decent mode
Alt dec > 1k. pressure schedule maint until set ref alt reached.
Auto Landing mode
WOW, or Gear down and <60kts
NO Press
. Cabin alt is equalized at set rate
. at .5 hg outflow and safety valves open.
Aux Vent
. Both A/Cs FCVs closed . Floor Heat SOVs Closed . Aux Vent Valves opened . Outflow opens to dep at 3,000 fpm . When dif Px
Emer Depress sw
- Both A/Cs FCVs closed
- Floor Heat SOVs Closed
- Both Outflow and Safety Valves open
- Depress at an uncontrolled rate
Emer Depress Handle
Door in aft escape hatch released.
