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What causes a DUAL BLEED Light?
APU bleed air valve open and engine No. 1 BLEED air switch ON
Engine No. 2 BLEED air switch ON, APU bleed air valve and isolation valve open.
What is the position of the isolation valve when the ISOLATION VALVE switch is in AUTO?
- ● Closes isolation valve if both engine BLEED air switches are ON and both air conditioning PACK switches are AUTO or HIGH.
- ● Opens isolation valve automatically if either engine BLEED air or air conditioning PACK switch positioned OFF.
What causes the WING-BODY OVERHEAT Light to illuminate?
An overheat from a bleed air leak in:
- ● Left light: left engine strut, left inboard wing leading edge, left air conditioning bay, keel beam, or APU bleed air duct.
- ● Right light: right engine strut, right inboard wing leading edge, or right air conditioning bay.
How do the engine bleed air valves work?
With the engine bleed air switch ON, the valve is DC activated and pressure operated.
What caused a BLEED TRIP OFF light to illuminate?
Excessive engine bleed air temperature or pressure.
What does pressing the TRIP RESET switch do?
(-3/5/700) Resets BLEED TRIP OFF, PACK TRIP OFF, and DUCT OVERHEAT lights.
(-800) Resets BLEED TRIP OFF, PACK and ZONE TEMP lights.
What will cause the DUCT OVERHEAT light to
illuminate and what will happen next?
Distribution air temperature in related duct exceeds limit.
Air mix valves drive full cold.
With the Air Conditioning PACK switch in AUTO, when will the packs be in low or high flow?
● With both packs operating, each pack regulates to low flow.
● With one pack operating, operating pack regulates to high flow in flight with flaps up.
● When operating one pack from APU (both engine BLEED air switches OFF), regulates to high flow.
With the Recirculation Fan (RECIRC FAN) switch in AUTO, when will the fan operate?
Fan signaled on except when both packs operating with either PACK switch in HIGH.
When will the PACK TRIP OFF light illuminate?
Indicates pack temperature has exceeded limits.
In an -800, what will cause one of the ZONE TEMP Lights to illuminate?
- ● CONT CAB indicates a duct temperature overheat or failure of the flight deck primary and standby temperature control.
- ● FWD CAB or AFT CAB indicates duct temperature overheat.
During Master Caution light recall:
- ● CONT CAB indicates failure of the flight deck primary or standby temperature control.
- ● Either FWD CAB or AFT CAB indicates failure of the associated zone temperature control.
In an -800, with the Recirculation (RECIRC) FAN switches in AUTO, when will the fans operate?
- IN FLIGHT:
- – The left recirculation fan operates if both packs are operating unless either PACK switch is in HIGH.
- – The right recirculation fan operates if both packs are operating unless both PACK switches are in HIGH.
- ON THE GROUND:
- – The left recirculation fan operates unless both PACK switches are in HIGH.
- – The right recirculation fan operates even if both PACK switches are in HIGH.
In an -800, what will cause a PACK Light to
- ● Indicates pack trip off or failure of both primary and standby pack controls.
- ● During Master Caution recall, indicates failure of either primary or standby pack control. Extinguishes when Master Caution is reset.
What will cause the AUTO FAIL light to illuminate?
- ● Indicates a single controller failure when ALTN light is also illuminated.
- ● Indicates a dual controller failure when illuminated alone.
When do the ram air inlet doors move to the full open position?
On the ground, or during slow flight with the flaps not fully retracted.
Where does the Recirculation Fan move air in the plane?
Air from the passenger cabin and electrical equipment bay is drawn to the forward cargo bay where it is filtered and recirculated to the mix manifold.
What will cause the amber AUTO FAIL light to illuminate?
- ● Loss of DC power
- ● Controller fault
- ● Outflow valve control fault
- ● Excessive differential pressure (> 8.75 psi)*
- ● Excessive rate of cabin pressure change (±2,000 sea level ft/minute)*
- ● High cabin altitude (above 15,800 ft)*
- ● Loss of AUTO AC power
- ● Excessive rate of cabin pressure change (1,890 sea level ft/min)
- ● High cabin altitude (13,875 ft)
What will cause one of the Window Heat ON lights to extinguish?
- ● Switch is OFF, or
- ● An overheat is detected, or
- ● A system failure has occurred
- ● System is at correct temperature
If the WING ANTI-ICE switch is left on when commencing takeoff, what will happen?
- ● Control valves close if either thrust is above takeoff warning setting or thermal switch is activated in either distribution duct. Switch remains ON.
- ● Switch trips OFF at lift-off.
What will happen to the stick shaker logic when either engine or wing anti-ice switch is turned on or off?
Either switch is turned on: Stick shaker logic is set for icing conditions. *
Engine anti-ice switch then turned OFF: Stick shaker logic returns to normal if wing anti-ice has not been used in flight.
Wing anti-ice switch then turned OFF: Stick shaker logic remains set for icing conditions for the remainder of the flight, regardless of subsequent switch position.
*NOTE: Stall warning logic adjusts stick shaker and minimum maneuver speed bars on the airspeed indicator. FMC displayed VREF is not adjusted automatically.
What does the wing anti-ice system provide bleed air to?
The three inboard leading edge slats by using bleed air. The wing anti-ice system does not include the leading edge flaps or the outboard leading edge slats.