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TM 55-4920-416-13
NAVAER 17-15C-539
Section IV
adjacent to the switch tells the operator that the unit is
4-13. ALTIMETER (9, figure 4-1). This altimeter has a useful
operating.
range from 1,000 feet below mean sea level to 80,000 feet
above mean sea level. A barometric correction scale is part of
4-11. INDICATORS.
the altimeter.
4-12.  RATE OF CLIMB (8, figure 4-1).  This instrument
4-14. AIRSPEED (KNOTS) (10, figure 4-1). This instrument is
displays the rate of climb or descent in fpm according to the
a sensitive type which reads accurately over its full range of 50
rate of increase or decrease of the vacuum produced by the
to 650 knots.
test set. Vacuum is proportional to altitude; hence, a change in
vacuum is sensed by the rate-of-climb indicator as a change in
4-15. MANIFOLD PRESSURE (11, figure 4-1). This gauge is
altitude. The calibrated range of the indicator is 0  6000 fpm.
of the absolute pressure type, reading from 10 inches to 75
The instrument is designed to tolerate greater rates of change
inches of Hg, with 30 inches of Hg representing mean sea
for short periods of time, without damage.
level. When used at sea level, an indication below 30 inches
of Hg represents a vacuum in the test set. An indication above
30 inches of Hg represents a pressure in the test set.
CAUTION
4-16. FUEL PRESSURE (12, figure 4-1). This gauge is a
It should be noted however that a sudden
direct reading instrument, calibrated from zero to 25 psig.
buildup to high vacuum (high altitude) or
conversely a sudden drop from high
4-17. TEST SET CONNECTIONS.
vacuum to low vacuum (for example,
mean  sea  level),  can  damage  the
4-18.
POWER CONNECTOR (1, figure 4-3).
Power
instrument and render it useless.
1. Power Connector
4. Airspeed
2. Fuel Pressure
5. Rate-of-Climb
3. Manifold Pressure
and Altimeter
Figure 4-3. Test Set Connections
13

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