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The flaps failed to extend during approach causing the flight crew to go around to run checklist on the problem. The flaps were successfully cycled several times after landing and then were operated without benefit of an aircraft equipment write-up or maintenance release.
| Attributes | |
| ACN | 494450 |
| Time | |
| Date | 200012 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : bos.airport |
| State Reference | MA |
| Altitude | agl bound lower : 0 agl bound upper : 1000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : bos.tower tower : cof.tower |
| Operator | common carrier : air carrier |
| Make Model Name | Beech 1900 |
| Operating Under FAR Part | Part 119 |
| Navigation In Use | other |
| Flight Phase | descent : approach landing : go around landing : 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 : 208 flight time total : 4011 |
| ASRS Report | 494450 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : multi engine pilot : commercial pilot : instrument |
| Events | |
| Anomaly | aircraft equipment problem : less severe maintenance problem : improper documentation non adherence : published procedure non adherence : company policies |
| Independent Detector | other flight crewa |
| Resolutory Action | aircraft : equipment problem dissipated flight crew : overcame equipment problem |
| Supplementary | |
| Problem Areas | Aircraft Flight Crew Human Performance |
| Primary Problem | Aircraft |
Narrative:
While on approach to land in boston to runway 33R in a beech 1900, our flaps failed to extend. We executed a go around and notified ATC. On the downwind leg, we performed the 'flaps fail to extend' abnormal checklist. ATC vectored us to land on runway 33L without incident. Once clearing the runway, I attempted to cycle the flaps and they worked. I cycled them 3 times before making a decision they were not broken. We had the airplane svced and loaded the passenger for our continuation. The problem is unknown, probably a microswitch. I believe that I should have called maintenance and MEL'ed the aircraft until it could be troubleshot. Let the mechanic decide if it is working properly. Always lean towards the conservative side of decision making in the flight deck.
Original NASA ASRS Text
Title: THE FLAPS FAILED TO EXTEND DURING APCH CAUSING THE FLC TO GO AROUND TO RUN CHKLIST ON THE PROB. THE FLAPS WERE SUCCESSFULLY CYCLED SEVERAL TIMES AFTER LNDG AND THEN WERE OPERATED WITHOUT BENEFIT OF AN ACFT EQUIP WRITE-UP OR MAINT RELEASE.
Narrative: WHILE ON APCH TO LAND IN BOSTON TO RWY 33R IN A BEECH 1900, OUR FLAPS FAILED TO EXTEND. WE EXECUTED A GAR AND NOTIFIED ATC. ON THE DOWNWIND LEG, WE PERFORMED THE 'FLAPS FAIL TO EXTEND' ABNORMAL CHKLIST. ATC VECTORED US TO LAND ON RWY 33L WITHOUT INCIDENT. ONCE CLRING THE RWY, I ATTEMPTED TO CYCLE THE FLAPS AND THEY WORKED. I CYCLED THEM 3 TIMES BEFORE MAKING A DECISION THEY WERE NOT BROKEN. WE HAD THE AIRPLANE SVCED AND LOADED THE PAX FOR OUR CONTINUATION. THE PROB IS UNKNOWN, PROBABLY A MICROSWITCH. I BELIEVE THAT I SHOULD HAVE CALLED MAINT AND MEL'ED THE ACFT UNTIL IT COULD BE TROUBLESHOT. LET THE MECH DECIDE IF IT IS WORKING PROPERLY. ALWAYS LEAN TOWARDS THE CONSERVATIVE SIDE OF DECISION MAKING IN THE FLT DECK.
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.