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bottom seat cushions and on the outboard side of each seat.
A shoulder panel (if installed) is mounted on the outboard
side of each seat. The shoulder panel is hinged from the
seat back so it can be moved aside for ease of exit from the
helicopter. The panel is secured in its normal position by a
latch and an exerciser cord.
TM 1-1520-240-10
2-1-7
Figure 2-1-5. Center Console With XM-130 Countermeasures (Typical) (Sheet 1 of 2)
TM 1-1520-240-10
2-1-8
Figure 2-1-5. Center Console With AN/ALE-47 Countermeasures (Typical) (Sheet 2 of 2)
TM 1-1520-240-10
2-1-9
2-1-21. Shoulder Harness Inertia Reel Lock Lever.
A two-position shoulder harness inertia reel lock lever is on
the left side of each seat (22, fig. 2-1-3) The lever positions
are LOCKED (forward) and UNLOCKED (aft). The lock may
be moved freely from one position to the other. When the
lock lever is in UNLOCKED position, the reel harness cable
is released to allow freedom of movement. However, the
reel will automatically lock if a horizontal impact force of 2 to
3 g is encountered. When the reel is locked in this manner,
it stays locked until the lock lever is moved forward to
LOCKED and then returned to UNLOCKED. When the lever
is at LOCKED, the reel is manually locked so the pilot is
restrained from bending forward. When a crash landing or
ditching is anticipated and time permits, manual locking of
the shoulder harness inertia reel provides added safety beyond
the automatic feature of the inertia reel. Depending on
the pilot’s seat adjustment, it may not be possible to reach
all switches with the inertia locked. Each pilot should check
and adjust the shoulder harness in locked position to determine
whether all switches can be reached.
2-1-22. Self -Tuning Dynamic Absorbers.
The helicopter is equipped with three sel-tuning dynamic
absorbers. One absorber is in the nose compartment and
the other two absorbers are under each pilot’s seat below
the cockpit floor. All three absorbers serve to maintain a
minimum vibration level through the normal operating
rotor RPM range of the helicopter. The self-tuning feature
of the the dynamic absorber functions as follows: each
dynamic absorber consists of tuning mass suspended by
springs, and electronic measuring circuit, accelerometers,
counter-weights, an electrical actuator and a selftest
box. The accelerometers sense and compare the
vibration phases of the helicopter and the springmounted
mass. When the measured vibration phases
differ from a built-in phase relationship required to assure
proper tune, the electronic circuit extends or retracts the
electrical actuator to reposition the counterweights
which, in turn, increases or decreases the resonant frequency
of the spring-mounted mass. The dynamic absorbers
are constantly being adjusted (tuned) to minimize
helicopter vibration. A self-test box is in the heater
compartment to provide maintenance personnel with an
integral testing capability for self-tuning feature of the
dynamic absorbers. Power is supplied by the No. 2 AC
bus through the VIB ABSORB-LH, CTR and RH circuit
breakers in the No. 2 PDP.
Figure 2-1-6. Canted Console (Typical)
TM 1-1520-240-10
2-1-10
Figure 2-1-7. Copilot Instrument Panel (Typical) 712
TM 1-1520-240-10
2-1-11
Figure 2-1-8. Center Instrument Panel (Typical) 712
TM 1-1520-240-10
2-1-12
Figure 2-1-9. Pilot Instrument Panel (Typical) 712
TM 1-1520-240-10
2-1-13
Figure 2-1-10. Overhead Switch Panel 712
TM 1-1520-240-10
2-1-14
Figure 2-1-11. Copilot Instrument Panel 714A
TM 1-1520-240-10
2-1-15
1. IFF indicator light
2. TSEC KY-58 indicator light
3. FIRE PULL handles with NVG filters
4. FIRE DETR test switch
5. AGENT DISCH switch
6. Gas producer tachometer
7. Power turbine inlet temperature (PTIT) indicators
8. Transmission oil pressure indicator
9. XMSN OIL PRESS selector switch
10. Longitudinal cyclic trim (LCT) indicators
11. Transmission oil temperature indicator
12. Fuel flow indicator
13. XMSN OIL TEMP selector switch
14. Fuel quantity indicator
15. FUEL QUANTITY selector switch
16. CAUTION LT and VHF ANT SEL panel
17. Engine oil pressure indicators
18. Engine oil temperature indicators
19. Caution/ADVISORY panel
20. Missile Alert display
21. GPD ALERT indicator light
22. GPS ZEROIZE switch
Figure 2-1-12. Center Instrument Panel 714A
TM 1-1520-240-10
2-1-16
Figure 2-1-13. Pilot Instrument Panel 714A
TM 1-1520-240-10
2-1-17
　
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