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switch spring loaded to center off position labeled
FWD and AFT.
NOTE
Do not test the cruise guide system with rotors
turning. False indications will result.
When the switch is placed from the center position to
each test position, the pointer on the indicator should
indicate within the white test band. The white test band
indicates proper system operation.
When the test function is activated, circuits from the
strain gages to the indicator are tested. However, separation
of the bond of the strain gage to a link will not be
detected by the test function. The narrow white line towards
the high end of the striped red-and-yellow band is
used for calibrating the indicator during bench test.
Figure 2-14-1. Cruise Guide Indicator
2-14-5. Airspeed Indicator.
There are two airspeed indicators located on the upper
left portion of the copilot and pilot instrument panel (fig.
2-1-7 and 2-1-9). The difference between dynamic pressure
and static pressure as measured by the pitot static
system is introduced into these instruments. Indicated
airspeed is shown in knots.
2-14-6. Altimeter.
An AIMS altimeter is provided for the pilot (fig. 2-14-2).
In the term AIMS, the A stands for Air Traffic Control
Radar Beacon System (ATCRBS), the I stands for identification
friend or foe (IFF), the M represents the Mark XII
identification system, and the S means system. A pneumatic
counter-drum-pointer type altimeter is installed for
the copilot. The pilots altimeter is a pneumatic counterdrum-
pointer type which is a self-contained unit consisting
of a precision pressure altimeter combined with an
altitude encoder.
Simultaneously, the display indicates and the encoder
transmits through the transponder the altitude of the helicopter.
Altitude is displayed on the altimeter by a
10,000-foot counter, and a 100-foot drum. A single pointer
indicates hundreds of feet on a circular scale with
50-foot center markings. Below 10,000 feet a diagonal
TM 1-1520-240-10
2-14-2 Change 3
warning symbol will appear on the 10,000 foot counter.
Power to operate the AIMS altimeter is supplied by the
No. 2 DC bus through the NAV AIMS ALT circuit breaker
on the No. 2 PDP.
A barometric pressure setting knob is provided to insert
the desired altimeter setting in inches of Hg. A vibrator
Figure 2-14-2. AIMS Altimeter
powered by No. 2 DC bus is contained in the altimeter
and requires a minimum of 1 minute warmup before
checking or setting the altimeter. If DC power to the altitude
encoder is lost, a warning flag placarded CODE
OFF appears in the upper left instrument dial.
The flag indicates that the altitude encoder is inoperative
and that the system is not reporting altitude to ground
stations. The CODE OFF flag monitors only the encoder
function of the altimeter. It does not indicate transponder
condition. The AIMS altitude reporting function can be
inoperative without the CODE OFF flag showing, as in
case of transponder failure or improper control settings.
It is also possible to get a good Mode C test on the
transponder control with the CODE OFF flag showing.
Display of the CODE OFF flag only indicates an encoder
power failure or a CODE OFF flag failure. In this event,
check that DC power is available and the circuit breakers
are in. If the flag is still visible, radio contact should be
made with a ground radar site to determine whether the
AIMS altitude reporting function is operative. The remainder
of the flight should be conducted accordingly.
2-14-7. Preflight Operation — Altimeter.
If the AIMS altimeter encoding function is to be used
during flight, perform the following steps before takeoff:
CAUTION
If the baroset knob binds or sticks, do not
use excessive force to set the altimeter.
Excessive force can damage altimeter
gears, resulting in altimeter error. Settings
can sometimes be made by backing off the
knob and turning at a slower rate.
a. Set the pilot’s altimeter to the field barometric
setting.
b. Check that the pilot’s altimeter indicates within ±
70 feet of field elevation. If the altimeter error is greater
than ± 70 feet, do not use the altimeter for IFR flight.
2-14-8. In Flight Operation — Altimeter.
Operate the AIMS altimeter function as follows:
a. Be sure the IFF set is on and set to the proper
code.
b. Be sure the altimeter is set to the local altimeter
setting.
c. Set the M-C (mode c) switch on the IFF control
panel to ON.
d. Check that the red CODE OFF flag is not visible
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