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should not be performed in the analog
mode due to slower engine response
and recovery times.
Operation in the analog mode will not
be considered as normal operations.
Flight with a high gross weight/density
altitude will cause transients to the
extent that the low rotor/high rotor
warning messages may be activated.
Rapid transient maneuveres, rearward
flight, and rocket firing should be
avoided.
NOTE
In event of a FUEL CONT message, the
ESC should automatically switch to the
analog backup mode.
In event of a FUEL CONT caution message or engine
fluctuations/surging, proceed as follows:
1. NORM-ANLG BACKUP switch -- ANLG
descent if time permits.
9-20. FADEC FAILURE.
FADEC failures will be indicated to the pilot via the
FADEC FAIL audio tone and the FADEC FAIL and/or
FADEC MANUAL messages on the MFD. The FADEC
may fail to fixed fuel flow condition or under certain
remote instances, the FADEC automatically fails to
MANUAL. In this case the FADEC FAIL message will
be accompanied by a FADEC MANUAL message and
the AUTO/MAN switch may illuminate MAN.
a. Fixed Fuel Flow. In the event of an ECU failure,
the FADEC will fail at a fixed fuel flow rate that is the
same as the fuel flow rate required by the engine at the
time of failure. A FADEC failure that results in a fixed
fuel flow will be indicated by the FADEC FAIL audio
tone, a FADEC FAIL message and the AUTO/MAN
switch remaining in the AUTO mode. Depending on
altitude, airspeed and the amount of power applied at
the time of failure, the aircraft may be operated in the
fixed fuel flow condition until the pilot is prepared to
make the switch to manual mode.
WARNING
Failure to switch to manual mode will
cause main rotor RPM to droop/
overspeed as collective Is increased/
decreased.
b. Fail to Manual Mode. In the event that the
FADEC automatically fails to the manual mode, the
HMU will default to the maximum fuel flow attainable
after the HMU pistons engage. This is because the
throttle is in the full open position when The FADEC
automatically switches to the manual mode. System
failures that will drive the FADEC to automatically
switch to the manual mode are:
(1) Total and complete loss of all electrical power
(simultaneous failure of AC generator, DC generator,
battery, and PMA, or a specific ECU internal
connection failure).
(2) Open or short failure of the FADEC AUTO/
MAN switch.
(3) Failure of the AUTOMATIC/MANUAL solenoid
valve, in the HMU.
CAUTION
The FADEC MANUAL mode is designed
for power modulation upon selection/ECU
failure. When performing FADEC
MANUAL operations, the pilot must
coordinate throttle and collective inputs.
Failure to do so may result in engine
overspeed, overtemp, overtorque, or
inadvertent activation of the NP
overspeed protection system. The pilot
must also rate limit throttle movement to
prevent engine surges as the engine is
not self-recoverable from stall in the
FADEC MANUAL mode.
TM 1-1520-248-10
Pilot procedures for both failures, fixed fuel flow and
Fail to manual mode are the same.
FADEC MANUAL OPERATION – Perform.
9-21. FADEC DEGRADE.
In the event of a FADEC DEGRADE advisory message,
The mode and extent of degradation (Table 9-7) may be
Determined in flight by accessing the FADEC
MONITOR page.
TABLE 9-7. FADEC DEGRADE MESSAGES
MESSAGE DEFINITION
FADEC FADEC system has detected a fault that
DEGRADE results in a loss of the FADEC
OS OVERSPEED limiting system.
FADEC FADEC system has detected a fault that
DEGRADE will result in possible rotor droop.
DROOP
FADEC TRQ FADEC system has detected a fault that
LIM LOSS results in a loss of the FADEC engine
limiting feature.
FADEC CDS determines that ARINC bus
DEGRADE interface is degraded.
ARINC
NOTE
In the event of FADEC DEGRADE message,
determine impact on the aircraft/crew
mission effectiveness and decide to
continue or abort the mission.
9-22. FADEC MANUAL START.
FADEC manual start is available in the event
Emergency evacuation of helicopter is necessary and
FADEC automatic start is not working.
1. FADEC AUTO/MAN switch – MAN.
2. Throttle – Check closed.
3. Collective – Full down.
4. BATTERY – ON.
9-20
5. FUEL BOOST switch – FUEL BOOST.
6. START switch – Press and hold for 10
seconds to engage the manual mode pistons.
7. TGT – 150 °C or less.
CAUTION
During a manual start the starter switch
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OPERATOR’S MANUAL FOR ARMY OH-58D HELICOPTER 2(90)
