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  TM 10-1670-265-12&P
T.O. 13C7-1-21
4-17. ASPSU - Test (Cont)
4-17
TESTING (Cont)
2. Operational test procedures (Cont).
c. Testing (Cont).
HIGH PRESSURE READING
(17)
Repeat steps c10 through c14 above.
(18)
Set BARO. PRES. switch on ASPSU to 30.4.
(19)
Close the pressure chamber door.
(20)
Repeat steps c1 through c9 above and record the altitude at which the FIRE indicator lights.
NOTE
Fire altitudes and recorded data will reflect a difference in altitude relative to the initial altitude checks. This difference
should correspond directly to the difference between 29.9 and 29.6 inches of mercury. Note that FIRE altitudes are
decreased from initial altitude checks by-500' ±250' for altitudes of 9,900' to 5,000' and -500' ±150' for altitudes of 4,900'
to 100'.
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