TM 10-1670-305-23&P
0010 00-5
TEST CHAMBER ASSEMBLY, MODEL 453
0010 00
OPERATION UNDER USUAL CONDITIONS
FALL RATE TEST
RANGE
1. Obtain a timer (stop watch).
2. Press and hold HOLD DOWN TO SET switch (13), use SET ALTITUDE control (4) to set
altitude to 3000 100 feet as observed on ALTITUDE (FT MSL) display (20). Release HOLD
DOWN TO SET switch (13).
3. Press and hold HOLD DOWN TO SET switch (13); use SET FALL RATE control (5) to
achieve 26 1 ft/sec fall rate as observed on FALL RATE (FT/SEC) display (19). Release
HOLD DOWN TO SET switch (13).
4. Press GO TO ALT AND DWELL switch (7).
5. When ALTITUDE DWELL indicator (6) stops flashing, use altitude chamber switch lever (1) to
set AR2 JUMP/OFF switch to JUMP.
6. Press FALL switch (9). Set AR2 JUMP/OFF switch to OFF.
7. At first reading below 2000 feet start timer and record altitude. At first reading below 1000
feet, stop timer and record altitude.
8. Difference between two altitude readings divided by the time equals the fall rate. Fall rate
shall be less than 30 ft/sec.
9. Repeat step 2 using 4000 100 feet.
10. Repeat step 3 using 225 1 ft/sec.
11. Press GO TO ALT AND DWELL switch (7).
12. When ALTITUDE DWELL indicator (6) stops flashing set AR2 JUMP/OFF switch to JUMP.
13. Press FALL switch (9); set AR2 JUMP/OFF switch to OFF.
14. At first reading below 2000 feet start timer and record altitude. At first reading below 1000
feet, stop timer and record altitude.
15. Difference between two altitude readings divided by the time equals the fall rate. Fall rate
shall be greater than 200 ft/sec.
16. Repeat steps 2 through 15 using a preset altitude of 27,000 feet for the 26 ft/sec test and
28,000 feet for the 225 ft/sec test. Determine the fall rate between 26,000 feet and 25,000
feet for both tests.
17. If no other tests are to be performed, follow shut down after testing procedures at end of this
work package.
