<< >> NASA ASRS Report 116633, July 1989

Air carrier medium large transport had problem extending main landing gear. Eventually landed with gear extended but gear doors not stowed up.

Attributes
ACN	116633
Time
Date	198907
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : pit
State Reference	PA
Altitude	agl bound lower : 0 agl bound upper : 3000
Environment
Flight Conditions	Marginal
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : pit tower : pit
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent : approach landing other
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 200 flight time total : 8500 flight time type : 3500
ASRS Report	116633
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : declared emergency flight crew : overcame equipment problem
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

On approach gear was extended. Indicators showed neither main gear had extended, nose gear was down and gear doors had not returned to an up-lock position. Recycled the gear twice. The left main gear now showed down and a fly by the tower confirmed this. Shortly thereafter the right main gear indicated down. All indicators showed the gear to be extended and locked with the gear doors not locked up. We elected to make another fly by the tower to confirm. We then returned and landed without incident. A later check indicated a malfunction of a gear door. All methods of determining the gear was down and locked were exercised. Equipment was standing by. An emergency was not declared as we were convinced the gear was locked down and the aircraft is designed to land with the gear doors extended (in the event of loss of hydraulic etc). Perhaps declaring an emergency would reduce the concern of possibly violating an far and ease the workload.

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Original NASA ASRS Text

Title: ACR MLG HAD PROBLEM EXTENDING MAIN LNDG GEAR. EVENTUALLY LANDED WITH GEAR EXTENDED BUT GEAR DOORS NOT STOWED UP.

Narrative: ON APCH GEAR WAS EXTENDED. INDICATORS SHOWED NEITHER MAIN GEAR HAD EXTENDED, NOSE GEAR WAS DOWN AND GEAR DOORS HAD NOT RETURNED TO AN UP-LOCK POSITION. RECYCLED THE GEAR TWICE. THE LEFT MAIN GEAR NOW SHOWED DOWN AND A FLY BY THE TWR CONFIRMED THIS. SHORTLY THEREAFTER THE RIGHT MAIN GEAR INDICATED DOWN. ALL INDICATORS SHOWED THE GEAR TO BE EXTENDED AND LOCKED WITH THE GEAR DOORS NOT LOCKED UP. WE ELECTED TO MAKE ANOTHER FLY BY THE TWR TO CONFIRM. WE THEN RETURNED AND LANDED WITHOUT INCIDENT. A LATER CHECK INDICATED A MALFUNCTION OF A GEAR DOOR. ALL METHODS OF DETERMINING THE GEAR WAS DOWN AND LOCKED WERE EXERCISED. EQUIPMENT WAS STANDING BY. AN EMER WAS NOT DECLARED AS WE WERE CONVINCED THE GEAR WAS LOCKED DOWN AND THE ACFT IS DESIGNED TO LAND WITH THE GEAR DOORS EXTENDED (IN THE EVENT OF LOSS OF HYDRAULIC ETC). PERHAPS DECLARING AN EMER WOULD REDUCE THE CONCERN OF POSSIBLY VIOLATING AN FAR AND EASE THE WORKLOAD.

Data retrieved from NASA's ASRS site as of August 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.