4-17. ASPSU - Test (Cont)
2. Operational test procedures (Cont).
c. Testing (Cont).
(6) The IGN CHECK red light (9) should be on. This verifies that the cutter ignition circuit is complete.
(7) If the IGN CHECK fails to light the cutter is bad and must be replaced. To remove the ASPSU from the
tester, proceed to step d. Replace unserviceable cutter and repeat paragraphs 4-16 and 4-17.
(8) Observe altimeter and FIRE indicator (10). Place ALT. DECR. switch (11) to up position, read and record
the altitude at which the FIRE indicator lights. If the FIRE indicator lights within following tolerances, it may be used.
Dz Firing Altitude
Fire Altitude Tolerances
Further readings as follows, are required to assure that the bellows are adjusting to various barometric pressure changes.
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