-
the FAULT light comes on momentarily and then remains off.
NOTE : In this step fuel pump 1 is used
____ to pressurize the check valve 34QM(36QM) in the reverse direction to the normal fuel flow.
2. Push (in) the L TK PUMP 2 (R TK In the L TK PUMP 2 (R TK PUMP 2) P/BSW: PUMP 2) P/BSW.
-
the OFF light goes off
-
the FAULT light comes on momentarily and then remains off.
R 1EFF : 001-049, 051-099, 101-149, 151-199, 1 28-21-00Page 558 1201-299, 401-499, 1Aug 01/05 1 1 1CES 1
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ACTION RESULT -------------------------------------------------------------------------------
3.
Release (out) the L TK PUMP 1 and PUMP 2 (R TK PUMP 1 and PUMP 2) P/BSWs.
4.
After 10 seconds, push (in) the L TK PUMP 2 (R TK PUMP 2) P/BSW.
5.
Push (in) the L TK PUMP 1 (R TK PUMP 1) P/BSW.
6.
Release (out) the L TK PUMP 1 and PUMP 2 (R TK PUMP 1 and PUMP 2) P/BSWs.
NOTE : If in this step the FAULT light
____ fails to come on momentarily, it shows that the CHECK VALVE-FUEL PUMP No 2, L(R) WING TK INR(OUTR) 34QM(36QM) has failed open.
In the L TK PUMP 1 and PUMP 2 (R TKPUMP 1 and PUMP 2) P/BSWs:
-
the OFF lights come on.
In the L TK PUMP 2 (R TK PUMP2) P/BSW:
-
the OFF light goes out
-
the FAULT light comes on momentarily and then remains off.
NOTE : In this step fuel pump 2 is used
____ to pressurize the check valve 33QM(35QM) in the reverse direction to the normal fuel flow.
In the L TK PUMP 1 (R TK PUMP 1) P/BSW:
-
the OFF light goes out
-
the FAULT light comes on momentarily and then remains off.
NOTE : If in this step the FAULT light
____ fails to come on momentarily, it shows that the CHECK VALVE-FUEL PUMP No 1, L(R) WING TK OUTR(INR) 33QM(35QM) has failed open.
In the L TK PUMP 1 and PUMP 2 (R TKPUMP 1 and PUMP 2) P/BSWs:
-the OFF lights come on.
R 1EFF : 001-049, 051-099, 101-149, 151-199, 1 28-21-00Page 559 1201-299, 401-499, 1Aug 01/05 1 1 1CES 1
R **ON A/C 301-399,
R Subtask 28-21-00-710-053-A
R B. Operational Check of the Wing Tank Pump Pressure Sense Line Check Valves
R (222QM, 223QM, 224QM and 225QM)
R NOTE : This test is to make sure that the check valves have not failed in____
R the open position. These check valves are installed in the ambient
R fuel supply lines to the Integrated Drive Generator (IDG)
R cooling-system.
R In normal operation all wing-tank fuel-pumps run during flight.
R If one of these check valves fail in the open position, a
R fuel-pump failure will not be detected by the related fuel-pump
R pressure-switch.
R This is because fuel (under pressure from the active pump) has an
R unrestricted path to the pressure-switch of the failed pump.
R The unrestricted path is through the failed open check valve.
R This only applies to fuel-pumps in the same wing.
R Fuel-pump failures in the opposite wing will stay detectable.
R This check is for the left tank (L TK) pumps. For the right tank (R TK)
R pumps, use the indications in parentheses.
R -------------------------------------------------------------------------------
R ACTION RESULT
R -------------------------------------------------------------------------------
R 1. Push (in) the L TK PUMP 1 (R TK In the L TK PUMP 1 (R TK PUMP 1) P/BSW:
R PUMP 1) P/BSW.
R - the OFF light goes off
R - the FAULT light comes on momentarily
R and then remains off.
R NOTE : In this step fuel pump 1 is used____
R to pressurize the check valve
R 222QM(225QM) in the reverse
R direction to the normal fuel
R flow.
R 2. Push (in) the L TK PUMP 2 (R TK In the L TK PUMP 2 (R TK PUMP 2) P/BSW:
R PUMP 2) P/BSW.
R - the OFF light goes off
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