TB 9-4920-363-24
NOTE
It may be necessary to repeat (4) and (5) above until no further
adjustments are required.
(6) Push indicator adjuster in and secure ALT meter barometer adjustment
locking screw.
9. Rate of Climb Indicator
a. Performance Check
(1) Set pneumatic pressure standard to indicate rate of climb in feet per minute.
(2) Turn RATE OF CLIMB case leak selector valve to OPEN.
(3) Adjust TI rate of climb zero adjustment screw for zero indication.
(4) Turn safety control valve (located on rear of TI) to closed position.
NOTE
Some models do not have safety control valve.
(5) Set PRESSURE selector control to OFF and VACUUM selector control to
ALTIMETER AND RATE OF CLIMB position.
(6) Adjust VACUUM INCREASE and DECREASE valves fully cw and turn
PRESSURE INCREASE and DECREASE valves fully cw.
(7) Set TI POWER switch to ON.
(8) Slowly adjust VACUUM INCREASE and DECREASE controls until TI rate of
climb indicator shows 500 feet per minute.
(9) Press RATE OF CLIMB pushbutton on pneumatic pressure standard. After 1
minute, light will stop flashing. Record indication on pneumatic pressure standard.
(10) Repeat (9) above two times and average the three readings.
The average
reading will be between 400 and 600 feet per minute.
(11) Repeat technique of (8) through (10) above for TI rate of climb indications in
(12) Position TI controls as listed in (a) through (e) below:
(a) VACUUM INCREASE and DECREASE control valves for zero feet/
minute indication.
(b) POWER switch to OFF.
(c) VACUUM INCREASE and DECREASE control valves fully ccw.
(d) VACUUM and PRESSURE selector control valves to OFF.
(e) RATE OF CLIMB case leak selector valve to CLOSED.
