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will be normal, except that NG indications
will be lost and the corresponding
ENG OUT warning light
and audio will be activated.
The engine alternator has three windings, providing
power for engine ignition, aircraft NG speed indication,
and electrical control system operation. A failure of the
ignition winding would result in loss of electrical power
to the ignition circuitry which would be detected by inability
to start the engine. A failure of the winding providing
NG speed indication signal would not affect actual
engine operation; however, the pilot would have no
NG indication. A failure of the winding providing electrical
power to the engine ECU is the most severe
and requires immediate action by the pilot. The immediate
indication to the pilot may be the affected engine
accelerating to maximum power. There will also be
a loss of Np and torque indication. If this failure is due
to a complete loss of the alternator, then no NG indication
will be present either. The engine TGT will still be
indicating because it is not acted upon by the ECU
however, TGT limiting will no longer be available. Np
overspeed protection will be present because aircrarft
power is supplied for that function. If an alternator failure
is suspected and the affected engine accelerates to
maximum power, proceed as in HIGH RPM ROTOR
(warning light ON) NP FAILED HIGH.
If night or simulated night NOE,
reaction to the following malfunctions
must be immediate. Exit the
NOE environment immediately.
9-22 Change 4
9.16.6 Symbol Generator Failure. Failure of the
symbol generator will result in the loss of video to the
VDU and video recorder. Both the PLT and CPG HDUs
will automatically revert to PNVS FLIR-2 (PNVS video
with no symbology). The ORT, HOD or HDD, as selected,
will automatically revert to TADS FLIR-2
(TADS FLIR video). If the CPG VID SEL switch is positioned
to TADS, the LOS reticle and the IAT gates (if
operational) symbology from the TEU will be displayed.
If the CPG VID SEL switch is set to PNVS, these symbols
will not be displayed. The AND display will continue
to operate normally. The pilot may continue flight in
a degraded mode without flight or weapon symbology.
The CPG may continue weapons engagement in a degraded
mode without range information.
9.16.7 TADS Electronic Unit (TEU) Failure. Complete
failure of the TEU will cause the CPG’s displays to lose
imagery and the AND to blank. The pilot may be limited
to ±75 degrees in azimuth on the PNVS and the
message PNVS DIRECT will be displayed in the HAD
sight status section.
9.16.8 FLIR Cooler Failure. Failure of the PNVS or
TADS FLIR cooler normally occurs during FLIR cooldown
prior to flight. However, the cooler may fail in
flight. Cooler failures are indicated by a loss of resolution
on the FLIR. Resolution loss occurs gradually initially,
and becomes more rapid as detector temperatures
increase until resolution is lost completely. In the
event of a PNVS cooler failure, proceed as indicated in
PNVS failure emergency.
9.16.9 FCC Failure. Failure of the FCC (primary
MUX BUS Controller) will be indicated by illumination
of the MASTER CAUTION and PRI MUX caution
segment lights in the pilot and CPG stations. MUX
BUS control will be automatically assumed by the
BBC. In addition to the degradations listed in Chapter
4, the following effects will be present: DASE channels
may disengage causing temporary instability; range inputs
thru the DEK range page will be accepted but will
have no effect on ordnance delivery; laser designator
codes may not transfer to BBC registers and boresight
correction data will not be available in the BBC. In the
event of a PRI MUX failure, DASE channels should be
re-engaged. The MUX switch should be placed in SEC.
If weapons system use is necessary, correct laser codes
should be confirmed and outfront boresight alignment
should be checked prior to weapons systems engagements.
TM 1-1520-238-10
APPENDIX A
REFERENCES
AR 70-50
AR 95-1
AR 95-13
AR 385-40
AR 385-63
FLIP
FM 1-202
FM 1-203
FM 1-230
FM 1-240
TB MED 501
TB MED 524
TM 1-1520-238-CL
TM 3-4240-312-12&P
TM 750-244- 1-5
TM 9-1095-206-13&P
TM 9-4935-476-13
TM 11-5810-262-OP
TM 11-5841-281-12
TM 11-5841-283-12
Designating and Naming Military Aircraft, Rockets, and Guided Missiles
Flight Regulations
Safety Procedures for Operation and Movement of Army Aircraft on the
Ground
　
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