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October 31, 2004
767 Flight Crew Training Manual
Non-Normal Operations
Copyright © The Boeing Company. See title page for details.
FCT 767 (TM) 8.13
If any jammed flight control condition exists, both pilots should apply force to try
to either clear the jam or activate the override feature. There should be no concern
about damaging the flight control mechanism by applying too much force to either
clear a jammed flight control or activate an override feature. Maximum force may
result in some flight control surface movement with a jammed flight control. If the
jam clears, both pilot’s flight controls are available.
Note: If a control is jammed due to ice accumulation, the jam may clear when
moving to a warmer temperature.
Some flight controls are linked together through override features. If the jam does
not clear, activation of an override feature allows a flight control surface to be
moved independently of the jammed control. Applying force to the non-jammed
flight control activates the override feature. When enough force is supplied, the
jammed control is overridden allowing the non-jammed control to operate. To
identify the non-jammed flight control, apply force to each flight control
individually. The flight control that results in the greatest aircraft control is the
non-jammed control.
Note: The pilot of the non-jammed control should be the pilot flying for the
remainder of the flight.
The non-jammed control requires a normal force, plus an additional override force
to move the flight control surface. For example, if a force of 10 lbs (4 kg) is
normally required to move the surface, and 50 lbs (23 kg) of force is required to
activate the override, a total force of 60 lbs (27 kg) is required to move the control
surface while in override. Response is slower than normal with a jammed flight
control; however, sufficient response is available for aircraft control and landing.
For those controls without override features, limited flight control surface
deflection occurs when considerable force is applied to the flight control. This
response is due to cable stretch and structural bending. This response may be
sufficient for aircraft control and landing.
Note: There are override features for the aileron and elevator.
Trim Inputs
If a jammed flight control condition exists, use manual inputs from other control
surfaces to counter pressures and maintain a neutral flight control condition. The
following table provides trim inputs that may be used to counter jammed flight
control conditions.
October 31, 2004
767 Flight Crew Training Manual
Non-Normal Operations
Copyright © The Boeing Company. See title page for details.
8.14 FCT 767 (TM)
Approach and Landing
Attempt to select a runway with minimum crosswind. Complete approach
preparations early. Recheck flight control surface operation prior to landing to
determine if the malfunction still exists. Do not make abrupt thrust, speedbrake,
or configuration changes. Make small bank angle changes. On final approach, do
not reduce thrust to idle until after touchdown. Asymmetrical braking and
asymmetrical thrust reverser deployment may aid directional control on the
runway.
Note: In the event of an elevator jam, control forces will be significantly greater
than normal and control response will be slower than normal to flare the
airplane.
Go Around Procedure
If the elevator is known or suspected to be jammed, a go-around should be avoided
if at all possible. To execute a go-around with a jammed elevator, smoothly
advance throttles while maintaining pitch control with stabilizer and any available
elevator. If a go-around is required, the go-around procedure is handled in the
same manner as a normal go-around.
Jammed Stabilizer
During flight test certification the worst-case jammed stabilizer condition was
evaluated. A satisfactory landing could be accomplished without the use of special
configurations or speeds. Adequate flare capability was available at flaps 30 and
flaps 20 using normal approach speeds. Therefore, a special NNC is not
considered necessary.
Unscheduled Stabilizer Trim
Hold control column firmly to maintain desired pitch attitude. If uncommanded
trim motion continues, the stabilizer trim commands are interrupted when the
control column is displaced in the opposite direction.
Jammed Control Surface Manual Trim Inputs
Elevator Stabilizer
Aileron Rudder*
Rudder Aileron*
*Asymmetric engine thrust may aid roll and directional
control.
October 31, 2004
767 Flight Crew Training Manual
Non-Normal Operations
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767机组训练手册Flight Crew Training Manual (FCTM)767(120)
