TM 10-1670-305-23&P
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ELECTRONIC TEST CHAMBER ASSEMBLY, MODEL 453
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OPERATION UNDER USUAL CONDITIONS - CONT
FALL RATE TEST - CONT
SELECTOR ACCURACY
1. Press and hold HOLD DOWN TO SET switch (13), use SET ALTITUDE control (4) to set
altitude to 7500 100 feet as observed on ALTITUDE (FT MSL) display (20). Release HOLD
DOWN TO SET switch (13).
2. Press and hold HOLD DOWN TO SET switch (13), use SET FALL RATE control (5) to
achieve 62.5 0.5 ft/sec fall rate as observed on FALL RATE (FT/SEC) display (19). Release
HOLD DOWN TO SET switch (13).
3. Press GO TO ALT AND DWELL switch (7).
4. When altitude dwell indicator (6) stops flashing, set AR2 JUMP/OFF switch to JUMP.
5. Press FALL switch (9). Set AR2 JUMP/OFF switch to OFF.
6. At first altitude reading below 6500 feet, start timer and record altitude.
7. At first altitude reading below 4500 feet, stop timer and record altitude.
8. Difference between two altitude readings divided by the time equals the fall rate
9. Press GO TO ALT AND DWELL switch (7). Wait until ALTITUDE DWELL indicator (6) stops
flashing.
10. Set AR2 JUMP/OFF switch to JUMP; press FALL switch (9).
11. Set AR2 JUMP/OFF switch to OFF; observe and record fall rate on FALL RATE (FT/SEC)
display (17) at approximately 5500 feet.
12. Repeat step 2 using 87.5 0.5 ft/sec.
13. Repeat steps 3 through 11.
14. Repeat step 1 using 12,500 100 feet. Leave fall rate set at 87.5 0.5 ft/sec.
15. Press GO TO ALT AND DWELL switch (7).
