Gulfstream G550, Руководство по эксплуатации

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D. Mach Trim:
The autopilot employs elevator control to provide the aircraft with Mach
trim. Mach trim is necessary because at high speed flight the center of lift
on the wing transits aft with increases in speed, producing a nose down
pitch moment termed Mach tuck. The autopilot electrically repositions the
elevator trim to neutralize the nose down force. Mach trim is an automatic
function of the Flight Guidance Computers.
NOTE:
The autopilot does not have to be engaged to provide
Mach trim. Automatic Mach trim is available whenever
the PITCH TRIM ENG/DISENG switch is engaged.
3. Controls and Indications:
(See Figure 4 through Figure 6.)
NOTE:
A full description of the Flight Controls 2/3 synoptic
page appears in section 2B-07-00.
A. Circuit Breakers (CBs):
The following CBs protect elevator pitch control:
Circuit Breaker Name: CB Panel: Location: Power Source:
ELEV SERVO #1 POP D-4 L ESS DC Bus
ELEV SERVO #2 CPOP D-4 R ESS DC Bus
PITCH TRIM SERVO #1 POP E-2 L ESS DC Bus
PITCH TRIM SERVO #2 CPOP E-1 R ESS DC Bus
L ELEV TRIM HEAT REER E-16 R MAIN AC Bus
R ELEV TRIM HEAT REER F-16 R MAIN AC Bus
LEFT ELEV HYD S/O POP C-5 L ESS DC Bus
RIGHT ELEV HYD S/O CPOP C-5 R ESS DC Bus
B. Crew Alerting System (CAS) Messages:
The following CAS messages are associated with the elevator pitch
controls:
Area Monitored: CAS Message: Message Color:
Elevator Trim Tab RVDTs vrs
takeoff range Aircraft Configuration Red
Elevator and Trim Tab RVDTs and
MAUs Elevator Mistrim Nose
Down Amber
Elevator and Trim Tab RVDTs and
MAUs Elevator Mistrim Nose Up Amber
L/R Elevator HOPS and MAUs L/R Elevator Hydraulics
Off Amber
Electric Pitch Trim Servos Elevator Trim 1-2 Fail Amber
OPERATING MANUAL
PRODUCTION AIRCRAFT SYSTEMS
2A-27-00
Page 13
August 14/03
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