Rate of Climb Indicator

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

table 4. Pneumatic pressure standard will indicate within limits specified.

(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.

(d) VACUUM and PRESSURE selector control valves to OFF.

(e) RATE OF CLIMB case leak selector valve to CLOSED.