TB 9-4920-457-24
(9) If all average indications recorded in (5) through (8) above are within tolerances
listed in table 5, annotate correction chart and place in holder on faceplate of TI. The
correction chart will show standard indications when TI indicates nominal values.
b. Adjustments. No further adjustments can be made.
Table 5. Vertical Speed Indicator Check
Test instrument
Pneumatic pressure standard indications
indications
(fpm)
(fpm)
Min
Max
21
31
41
61
21
31
41
61
500
465
465
400
400
535
535
600
600
1000
925
925
800
800
1075
1075
1200
1200
1500
1350
1350
---
---
1650
1650
---
---
2000
---
1750
1700
1700
---
2250
2300
2300
3000
---
---
2700
2700
---
---
3300
3300
4000
---
---
---
3600
---
---
---
4400
50002
---
---
---
4500
---
---
---
5500
-500
-465
-465
-400
-400
-535
-535
-600
-600
-1000
-925
-925
-800
-800
-1075
-1075
-1200
-1200
-1500
-1350
-1350
---
---
-1650
-1650
---
---
-2000
---
-1750
-1700
-1700
---
-2250
-2300
-2300
-3000
---
---
-2700
-2700
---
---
-3300
-3300
-4000
---
---
---
-3600
---
---
---
-4400
-5000
---
---
---
-4500
---
---
---
-5500
Middle digit of 3 digit code following basic model number (see table 1).
1
Maintain vertical speed indication at highest indication used for 3 minutes, close VACUUM CONTROL valve fully,
2
and proceed to -500 fpm indication.
10. Airspeed Indicator
a. Performance Check
(1) Connect pneumatic pressure standard Pt inlet port to TI PRESS PORT, using
hose supplied with TI.
(3) Set up pneumatic pressure standard as listed in (a) through (c) below:
(a) Select airspeed/parallel mode.
(b) Set units to knots.
(c) Open SDS valves.
(4) Open TI VACUUM VENT valve and close all other valves fully.
(5) Slowly adjust PRESSURE CONTROL valve for each applicable TI airspeed
pressure standard will indicate within the limits specified. Record TI error for each
indication.
CHANGE 1
