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down. Pressing the CONTROL button will start count
down sequence. When the clock reaches zero, an alarm
becomes active by flashing the numbers and the ET
counter will begin to count up. To reset the alarm press
either the SELECT or CONTROL button.
2-14-26. Test Mode.
To activate the test mode, press and hold the SELECT
button for three seconds and all numerical displays will
show an 8 and all annunciators will be active.
2-14-27. Master Caution System.
The master caution system provides the pilots with a
visual indication of helicopter conditions or faults (fig.
2-14-5 and 2-14-6). The components of the systems are
the 712 Master Caution Panel with NVG filter, 714A
Master Caution/Advisory Panel, two MASTER CAUTION
lights with NVG filters, and a CAUTION LT panel
with a TEST and BRT-DIM switch. Power to operate and
control the master caution system is supplied by the DC
essential bus through the LIGHTING CAUTION PN circuit
breaker on the No. 1 PDP.
TM 1-1520-240-10
2-14-8
2-14-28. 712 Master Caution Panel. 714A Master
Caution/Advisory Panel.
The Master Caution Panel is on the center instrument
panel (fig. 2-14-5 and 2-14-6). Each capsule is labeled
with word segments which are related to the fault or
condition. When a caution capsule illuminates, the word
segments lettered into the panel are of an amber color.
When they extinguish, the lettering is not readable.
Tables 2-14-1 and 2-14-2 contain lists of the word segments
displayed on the capsules and their actual meaning
and cause.
712 An NVG filter is provided for use during NVG operations.
The filter fits over the master caution panel and is
secured in place by hook and pile tape at its base. When
the filter is in this position, any light coming from the
caution lights will be NVG compatible. For normal operations,
the filter is rotated from its base to a horizontal
position, and stowed in a compartment above the master
caution panel.
EAPS 1
FAIL
EXT PWR
DUAL HOOK
FAULT
PWR STEER
EAPS 2
FAIL
EXT PWR
Figure 2-14-5. Master Caution System 712
TM 1-1520-240-10
2-14-9
Table 2-14-1. Master Caution Panel Capsules 712
WORD SEGMENT EXPLANATION
XMSN OIL HOT Transmission oil temperature is more than 140
C.
XMSN OIL PRESS Transmission main oil pressure is less than 20 psi, or less than 10 psi in the aft rotor
shaft.
XMSN AUX OIL
PRESS
Less than 20 psi auxilliary oil pressure in the forward, or aft transmision or less than 10
psi in the combining transmission.
NO. 1 ENG OIL LOW Approximately 2 qt of usable oil is remaining in No. 1 engine oil tank.
NO. 2 ENG OIL LOW Approximately 2 qt of usable oil is remaining in No. 2 engine oil tank.
L FUEL PRESS Left fuel pressure is below 10 psi.
R FUEL PRESS Right fuel pressure is below 10 psi.
PWR STEER Steering control has been disabled due to system malfunction or steering limits have
been exceeded.
NO. 1 HYD FLT
CONTR
No. 1 flight control hydraulic system pressure is below 1,800 psi.
NO. 2 HYD FLT
CONTR
No. 2 flight control hydraulic system pressure is below 1,800 psi.
UTIL HYD SYS Utility hydraulic system pressure is below 1,800 psi.
PARK BRAKE ON Parking brake is on.
NO. 1 RECT OFF Transformer-rectifier has failed or the generator ouput is interrupted.
NO. 2 RECT OFF Transformer-rectifier has failed or the generator ouput is interrupted.
NO. 1 GEN OFF No. 1 generator is inoperative on the generator switch is at OFF.
NO. 2 GEN OFF No. 2 generator is inoperative on the generator switch is at OFF.
BATT SYS MAL Battery or battery charging system has failed or the battery has exceeded the safe operating
temperature.
EXT PWR This light comes on whenever external power is connected to the bus.
L FUEL LOW Left main fuel tank has approximately 20 percent fuel remaining.
R FUEL LOW Right main fuel tank has approximately 20 percent fuel remaining.
HEATER HOT Temperature within heater is greater than 177
C.
MID HOOK OPEN The midcargo hook has been opened, either hydraulically, pneumatically, or manually.
APU ON The APU is up to speed and can be used.
DUAL HOOK FAULT The forward and/or aft hook circuit has an electrical fault and the hook(s) shall not be released
electrically.
FWD HOOK OPEN The forward cargo hook has been opened either electrically or manually.
AFT HOOK OPEN The aft cargo hook has been opened either electrically or manually.
NO. 1 AFCS OFF The No. 1 AFCS is off, failed, or DASH is reprogramming.
NO. 2 AFCS OFF The No. 2 AFCS is off, failed, or DASH is reprogramming.
No. 1 ENG CHIP DET Metal chips in No. 1 engine or engine transmission oil.
　
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