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¼ inch or more in any flap position, the circuit to the flap control relay is
broken. The relay de-energizes to close the flap shutoff valve. Hydraulic
pressure stops and the flaps stop moving. In order to maintain lateral
stability, once flap operation is stopped due to asymmetry, further flap
movement in either direction is not possible.
For SPZ-8400 equipped aircraft having ASC 69A (Flap Asymmetry
Indicator Installation) incorporated: When the flap control relay
OPERATING MANUAL
PRODUCTION AIRCRAFT SYSTEMS 2A-27-00
Page 57
October 11/02
Revision 8
de-energizes to close the flap shutoff valve, a signal is sent causing an
amber FLAP ASYMMETRY caution message is displayed on the Crew
Alerting System (CAS).
For SPZ-8000 equipped aircraft having ASC 69A incorporated: When
the flap control relay de-energizes to close the flap shutoff valve, a signal is
sent causing an amber FLAP ASYM indicator (below the FLAP / STAB
position indicator) to illuminate.
H. Flap Position Indication System:
A flap position transmitter is installed on the central gearbox. As the flaps
extend and retract, an output shaft on the gearbox rotates the transmitter
shaft, sending an electrical signal to the FLAP pointer on the FLAP / STAB
position indicator.
I. Aircraft Configuration Warning System:
(See Figure 21.)
An aircraft configuration warning system monitors speed brake, power
lever and flap position to provide visual and aural warnings of an unsafe
aircraft configuration both on the ground and in flight.
The system receives inputs from the landing gear handle, speed brake
handle, power lever takeoff power, flap follow-up switches and nutcracker
switches. The Fault Warning Computers (FWCs) receive these inputs and
generate the appropriate warnings if an unsafe configuration is detected.
A red ACFT CONFIGURATION warning message will be displayed on
CAS, along with the associated warning tone, whenever the following
conditions exist:
• Extending the flaps to DOWN (39°) in flight with the SPEED BRAKE
handle not in the RETRACT detent
• Extending the landing gear in flight with the SPEED BRAKE handle
not in the RETRACT detent
• Advancing either power lever above 80% HP RPM on the ground
with the SPEED BRAKE handle not in the RETRACT detent
• Advancing either power lever above 80% HP RPM on the ground
with the FLAP handle set to UP (0°) or DOWN (39°), i.e., flaps not in
the takeoff range of 10° or T/O APPR (22°)
For aircraft having a Standby Warning Lights Panel (SWLP) installed, a red
ACFT CONFIG light will be illuminated whenever the following conditions
exist:
• Extending the flaps past T/O APPR (22°) in flight with the SPEED
BRAKE handle not in the RETRACT detent
• Extending the landing gear in flight with the SPEED BRAKE handle
not in the RETRACT detent
• Advancing either power lever above the takeoff power range on the
ground with the SPEED BRAKE handle not in the RETRACT detent
• Advancing either power lever above the takeoff power range on the
ground with the FLAP handle set to UP (0°) or DOWN (39°), i.e.,
flaps not in the takeoff range of 10° or T/O APPR (22°)
OPERATING MANUAL
2A-27-00 PRODUCTION AIRCRAFT SYSTEMS
Page 58
October 11/02
Revision 8
J. Flap Control Circuit Breakers:
The FLAP CONT circuit breaker incorporates a switch which closes if the
breaker opens (manually pulled or popped). Power through the closed
MANUAL FLAP CONT circuit breaker and asymmetry switches will then
energize the flap control relay. The flap control relay, in turn, energizes the
flap shutoff valve open and hydraulic pressure flows to the flap selector
valve. In this configuration, the EMER FLAP handle can be used to select
flap position. If the MANUAL FLAP CONT circuit breaker opens (manually
pulled or popped), both normal and emergency operation of the flaps is
inhibited.
K. Flap Operational Description:
(1) Normal Operation:
Moving the FLAP handle from one detent to another actuates one of
the four handle switches associated with the selected flap position.
The switch closes and power is routed through a follow-up switch
associated with the desired flap position and direction (e.g., down to
10°) to the flap control relay through flap asymmetry switches.
If the flaps are symmetrical, the flap control relay energizes. The flap
shutoff relay energizes to the open position and the flap selector
valve shifts to the extend or retract position. Combined, Utility or
Auxiliary hydraulic system pressure then flows through the open
　
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