Table 2-10. Airspeed Indicator
Displays SAT in Two digits and 6 sign from
99 °C to + 50 °C.
Dims Front Panel.
changes SAT to TAT.
2-79. STANDBY BAROMETRIC ALTIMETER.
altimeter, illustrated in Figure 2-36, provides an
indication of the aircraft's pressure altitude above sea
If the altimeter does not read within 70 feet
of field elevation, when the correct local
barometric setting is used, the altimeter
needs calibration or internal failure has
occurred. An error of greater than 70 feet
also nullifies use of the altimeter for IFR
b. Controls, Indicators, and Functions.
(1) Altitude Scale. Used in conjunction with
altitude indicator needle to indicate aircraft altitude in
hundreds of feet, subdivided into 20-foot increments.
(2) Counter-Drum Altitude Display. Indicates
aircraft altitude in tens of thousands, thousands, and
hundreds of feet above sea level.
(3) Altitude Indicator Needle. Used in
conjunction with altitude scale to display aircraft
altitude in hundreds of feet.
(4) Barometric Pressure Setting Knob. Used
to manually set barometric pressure displayed in the
IN HG display.
(5) Barometric Pressure Display (Inches of
Mercury). Indicates the barometric pressure in inches
of mercury that has been set by the barometric
pressure setting knob.
1. Altitude Scale
2. Counter-Drum Altitude Display
3. Altitude Indicator Needle
4. Barometric Pressure Setting Knob
5. Barometric Pressure Display (Inches of
Figure 2-36. Standby Barometric Altimeter
a. Pilot's Servoed Altimeter. The pilot's
altimeter provides a servoed counter drum/pointer
display of barometrically corrected pressure altitude,
derived from the air data computer system. T3 F3 For
proper operation, the 2 ampere AIR DATA ENCODER
circuit breaker located in the Avionics section of the
right sidewall circuit breaker panel must be set. The
altimeter is 26 Vac powered and is protected by the 1
ampere PILOT ALTM circuit breaker also located on
the right wall panel. R For proper operation, the
three ampere AIR DATA circuit breaker located in the
Flight Section of the right side wall circuit breaker
panel must be set. The altimeter is 26 Vac powered
and is protected by the 1-ampere PILOT VS ALTM
circuit breaker also located on the right wall panel.
1. Counter drum display of altitude, in 20
2. Pointer display of altitude between