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777-200 - 777-300ER
*Asymmetric engine thrust may aid roll and directional
control if TAC is inoperative.
October 31, 2006
777/787 Flight Crew Training Manual
Non-Normal Operations
Copyright © The Boeing Company. See title page for details.
8.14 FCT 777/787 Preliminary (TM)
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.
Inoperative Stabilizer
An inoperative stabilizer is indicated by the STABILIZER EICAS message. In
contrast to airplanes with conventional flight control systems, normal pitch trim is
still available in the normal flight control mode, however elevator authority is
limited. The QRH specifies a maximum inflight speed, adjusted approach speed
and landing configuration that ensures adequate elevator control is available for
the remainder of the flight. Use normal piloting techniques for landing.
Stabilizer
Hold the control column firmly to maintain the desired pitch attitude. If
uncommanded trim motion continues, the stabilizer trim commands are
interrupted when the control column is displaced in the opposite direction.
Flight Instruments, Displays
Airspeed Unreliable
Unreliable airspeed indications can result from blocking or freezing of the
pitot/static system or a severely damaged or missing radome. When the ram air
inlet to the pitot head is blocked, pressure in the probe is released through the drain
holes and the airspeed slowly drops to zero. If the ram air inlet and the probe drain
holes are both blocked, pressure trapped within the system reacts unpredictably.
The pressure may increase through expansion, decrease through contraction, or
remain constant. In all cases, the airspeed indications would be abnormal. This
could mean increasing indicated airspeed in climb, decreasing indicated airspeed
in descent, or unpredictable indicated airspeed in cruise.
Unreliable airspeed may cause noticeable effects in the normal speed stability of
the airplane since the normal pitch control law uses indicated airspeed. If the
indicated airspeed falls below 50 knots, the flight control system changes to the
secondary mode, which does not depend on airspeed.
The autothrottle system also uses indicated airspeed and should be turned off.
October 31, 2006
777/787 Flight Crew Training Manual
Non-Normal Operations
Copyright © The Boeing Company. See title page for details.
FCT 777/787 Preliminary (TM) 8.15
If the flight crew is aware of the problem, flight without the benefit of valid
airspeed information can be safely conducted and should present little difficulty.
Early recognition of erroneous airspeed indications require familiarity with the
interrelationship of attitude, thrust setting, and airspeed. A delay in recognition
could result in loss of airplane control.
The flight crew should be familiar with the approximate pitch attitude for each
flight maneuver. For example, climb performance is based on maintaining a
particular airspeed or Mach number. This results in a specific body attitude that
varies little with gross weight and altitude. Any significant change from the body
attitude required to maintain a desired airspeed should alert the flight crew to a
potential problem.
When the abnormal airspeed is recognized, immediately return the airplane to the
target attitude and thrust setting for the flight regime. If continued flight without
valid airspeed indications is necessary, consult the Flight With Unreliable
Airspeed/Turbulent Air Penetration table in the Performance Inflight section of
the QRH for the correct attitude, thrust settings, and V/S for actual airplane gross
weight and altitude.
Ground speed information is available from the FMC and on the instrument
displays. These indications can be used as a cross check. Many air traffic control
radars can also measure ground speed.
777-200 - 777-300ER
For airplanes equipped with an Angle of Attack (AOA) indicator, maintain the
analog needle at approximately the three o’clock position. This approximates a
safe maneuvering speed or approach speed for the existing airplane configuration.
Descent
Idle thrust descents to 10,000 feet can be made by flying body attitude and
checking rate of descent in the QRH tables. At 2,000 feet above the selected level
off altitude, reduce rate of descent to 1,000 FPM. On reaching the selected
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787机组训练手册Flight Crew Training Manual 787(128)
