4-18. ASPSU - Aline (Cont)
ASPSU Alinement (Cont).
Turn ALT. CAL. adjustment screw clockwise to decrease altitude; turn
Close the pressure chamber door.
Repeat steps 3 and 4 above until altitude error is within acceptable limits. If the ASPSU can not be alined,
replace with a serviceable unit from stock.
If you had been performing an operational test, proceed to paragraph 4-17, step 2c(9). However, if
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