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A B737-800 on takeoff from a short runway at V1. Right seat pilot flying lost all primary flight displays and other FMC/FMA functions.
| Attributes | |
| ACN | 569377 |
| Time | |
| Date | 200212 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-800 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | ground : takeoff roll |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 120 flight time total : 11000 flight time type : 20 |
| ASRS Report | 569377 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | observation : company check pilot |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | aircraft : equipment problem dissipated flight crew : overcame equipment problem flight crew : regained aircraft control |
| Consequence | other other |
| Supplementary | |
| Problem Areas | Aircraft Flight Crew Human Performance |
| Primary Problem | Aircraft |
Narrative:
On takeoff from a short runway in VMC conditions approaching V1 with a line check captain flying from the right seat, we experienced a loss of the first officer's primary flight display and several other mode control panel/FMC/FMA functions. Also lost flap indications, flight directors. Continued takeoff and control was transformed to the left seat. Inspector riding the jump seat helped us determine that the spare light bulb housing had fallen down snagging a circuit breaker on the P-6 panel.(circuit breaker # D-14 28V transfer bus 2 sect 22). After resetting the circuit breaker, electrical equipment was returned to normal. Luckily, this occurred in VMC conditions or it could have been a much more serious condition. I understand that the design of the spare bulb housing has been a problem on the B737-800 and the newer aircraft have an improved design. I believe they need to retrofit the older models of the B757-800 before this happens in a worse situation. Until then, we should emphasize the need to check the security of the spare bulb housing before each flight. Callback conversation with reporter revealed the following information: the reporter stated he was in the captain's seat during an initial operating experience and the check captain was flying from the right seat and an inspector was the jumpseat. The reporter said on takeoff from a short runway at V1 speed the pilot flying lost all primary instruments, mode control panels and FMC/FMA. The reporter stated control was transferred to the left seat and the takeoff continued. The reporter said it was discovered the spare bulb tray mounted on the P-6 circuit breaker panel had flopped down tripping circuit breaker D-14 28 vdc transfer bus 2 section 2. The reporter stated the breaker was reset and all instruments and displays were normal. The reporter said the latch or fastener used on the spare bulb tray is unreliable and later models of the B737-800 have positive latches.
Original NASA ASRS Text
Title: A B737-800 ON TKOF FROM A SHORT RWY AT V1. RIGHT SEAT PLT FLYING LOST ALL PRIMARY FLT DISPLAYS AND OTHER FMC/FMA FUNCTIONS.
Narrative: ON TKOF FROM A SHORT RWY IN VMC CONDITIONS APCHING V1 WITH A LINE CHECK CAPT FLYING FROM THE RIGHT SEAT, WE EXPERIENCED A LOSS OF THE FO'S PRIMARY FLT DISPLAY AND SEVERAL OTHER MODE CTL PANEL/FMC/FMA FUNCTIONS. ALSO LOST FLAP INDICATIONS, FLT DIRECTORS. CONTINUED TKOF AND CTL WAS TRANSFORMED TO THE LEFT SEAT. INSPECTOR RIDING THE JUMP SEAT HELPED US DETERMINE THAT THE SPARE LIGHT BULB HOUSING HAD FALLEN DOWN SNAGGING A CIRCUIT BREAKER ON THE P-6 PANEL.(CB # D-14 28V TRANSFER BUS 2 SECT 22). AFTER RESETTING THE CB, ELECTRICAL EQUIPMENT WAS RETURNED TO NORMAL. LUCKILY, THIS OCCURRED IN VMC CONDITIONS OR IT COULD HAVE BEEN A MUCH MORE SERIOUS CONDITION. I UNDERSTAND THAT THE DESIGN OF THE SPARE BULB HOUSING HAS BEEN A PROB ON THE B737-800 AND THE NEWER ACFT HAVE AN IMPROVED DESIGN. I BELIEVE THEY NEED TO RETROFIT THE OLDER MODELS OF THE B757-800 BEFORE THIS HAPPENS IN A WORSE SIT. UNTIL THEN, WE SHOULD EMPHASIZE THE NEED TO CHECK THE SECURITY OF THE SPARE BULB HOUSING BEFORE EACH FLT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED HE WAS IN THE CAPT'S SEAT DURING AN INITIAL OPERATING EXPERIENCE AND THE CHK CAPT WAS FLYING FROM THE R SEAT AND AN INSPECTOR WAS THE JUMPSEAT. THE RPTR SAID ON TKOF FROM A SHORT RWY AT V1 SPEED THE PLT FLYING LOST ALL PRIMARY INSTRUMENTS, MODE CTL PANELS AND FMC/FMA. THE RPTR STATED CTL WAS TRANSFERRED TO THE L SEAT AND THE TKOF CONTINUED. THE RPTR SAID IT WAS DISCOVERED THE SPARE BULB TRAY MOUNTED ON THE P-6 CIRCUIT BREAKER PANEL HAD FLOPPED DOWN TRIPPING CIRCUIT BREAKER D-14 28 VDC TRANSFER BUS 2 SECTION 2. THE RPTR STATED THE BREAKER WAS RESET AND ALL INSTRUMENTS AND DISPLAYS WERE NORMAL. THE RPTR SAID THE LATCH OR FASTENER USED ON THE SPARE BULB TRAY IS UNRELIABLE AND LATER MODELS OF THE B737-800 HAVE POSITIVE LATCHES.
Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.