B737-700
Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 100
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy
Aircraft; Manuals
On approach to ZZZ XXL; First Officer called for Landing Checklist. We noticed no illuminated green 'leading edge flaps extended'. We did go-around and got vectors in the area at 3;000 feet while working the problem. I could not find a QRH (Quick Reference Handbook) checklist for the omission of that light. The FO (First Officer) and I exchanged controls. He was also unable to find a QRH checklist for this problem. While being vectored we extended the flaps and could visually see by looking out our windows that the leading edge flaps were indeed extending normally; and that it was an indication problem. The following lights were not illuminating at all. Leading Edge Flap Transit; Leading Edge Flap Extend; and the overhead Leading Edge devices indication lights. After triple checking no checklists would cover our problem; and after we verified the leading edge devices were fully extended; we made a normal flaps 30 uneventful landing. After landing the PSEU (Proximity Switch Electronics Unit) light illuminated.
As the Pilot Flying (PF) I called for flaps 30 and the Before Landing Checklist on the visual approach to XXL into ZZZ. The Captain (Pilot Monitoring) ran the checklist and we discovered that the Leading Edge Flap Extend green light was not illuminated. We executed a go-around to give ourselves more time to assess the situation. At 3;000 feet and after ATC gave us vectors; the Captain proceeded to find the appropriate checklist in the QRH. He could not find any checklist for LE FLAPS EXT green light not illuminated. He then asked if I could look and I transferred aircraft control to the Captain. I looked and didn't find any checklist addressing our exact condition. At that time; I did a push to test on the LE FLAPS EXT (Green light); LE FLAPS TRANSIT (Amber light) and LE devices annunciator panel and all tested good. The Captain called for Flaps 1 and we verified visually by looking out the window that the LE Flaps did in fact deploy and the flap position indicator showed flaps 1; but LE FLAPS EXT (Green light); LE FLAPS TRANSIT (Amber light) and LE devices annunciator panel did not illuminate. I looked through the QRH again to see if we had missed anything and the closest checklist we could think was the LE FLAPS TRANSIT (Amber Light) but that light was not illuminated; so we elected to not use that checklist. Also searched the non-normal performance data to see if there was an option to select for our condition and there was not. After discussing together and visually confirming the LE flaps deployed; and no roll or yaw was felt in the controls and it correctly showed on the flaps position indicator; we elected to land normally with flaps 30. After landing during roll out; the PSEU illuminated. Maybe a QRH addressing this particular condition. In looking back; I believe that we could have used our commuting pilot in the cabin to visually check the inboard LE Flaps and Trailing Edge flaps were deployed. Also contacted Dispatch and got Maintenance to get another perspective on the indications we were seeing in the cockpit.
B737-700 flight crew could not find checklist for Leading Edge Devices Not Extended.