2010-03 · NASA ASRS report 879247
A B737-300 flight crew suffered the loss of trailing edge flap control and landed with only leading edge devices deployed.
On approach our trailing edge flaps failed to extend. I instructed the First Officer to scan all the circuit breakers [CBs]. He did and noted none out. We raised the gear; got extended vectors; and ran the QRH. Using the checklist; we tried the alternate flap extension which extended the leading edge flaps only. We continued the QRH and established our landing speed for our configuration. At about ten miles out; we configured with landing gear and leading edge flaps extended. I then asked the First Officer to check the circuit breakers one more time. This time he found the Alt Flap Ext-AC breaker right behind his head popped. I had him reset it. This raised the leading edge flaps. I increased airspeed slightly and instructed him to select flaps five. Again the trailing edge flaps did not move. I then told him to pull the CB and run the leading edge flaps back out using the Alternate Flap switch. He did and we ran through the QRH again to ensure we were back to our original configuration and speed. We continued with the Before Landing checklist and landed uneventfully. We also had notified Operatons and asked them to call Maintenance and Dispatch.
I looked out the window to confirm we had the leading edge flaps; and we didn't. Confirmed with the Captain that his were up. Then I put the alternate flap switch back to arm and drove the leading edge flaps back out using the alternate flap switch. After the QRH checklist is complete; do not try to diagnose the problem anymore. That's what the QRH is for.
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Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.
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