TM 55-1510-220-MTF
PROCEDURE
TROUBLESHOOTING
REFERENCE
PRIOR TO MAINTENANCE TEST FLIGHT (CONT)
*c. Interior, exterior, and annunciator lights - Check.
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*d. Fuel control panel - Check the standby pumps and firewall valves as follows to insure that they are
powered through the essential bus:
(1) Battery switch - OFF.
(2) Standby pump circuit breakers (left and right) - Pull.
(3) Firewall shutoff valve circuit breakers (left and right) - Pull.
(4) Firewall shutoff valve switches - Close (listen for operation).
(5) Standby pump switches - ON (listen for operation).
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(6) Battery switch - ON. Check #1 FUEL PRESS and #2 FUEL PRESS annunciator lights illuminated.
(7) Firewall shutoff valve switches - OPEN. Check #1 FUEL PRESS and #2 FUEL PRESS
annunciator lights extinguished.
(8) Standby pump switches - OFF.
(9) Standby pump circuit breakers (left and right) - In.
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