An EMB120 immediately after takeoff declared an emergency and diverted due to the right main gear un...

Attributes
ACN	393025
Time
Date	199802
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : zzz
State Reference	US
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Brasilia EMB-120 All Series
Operating Under FAR Part	Part 135
Flight Phase	other
Flight Plan	None
Person 1
Affiliation	company : air carrier
Function	other personnel other
ASRS Report	393025
Person 2
Affiliation	company : air carrier
Function	other personnel other
Qualification	other other : other
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other flight crewa other other : unspecified cockpit
Resolutory Action	flight crew : declared emergency other other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

Aircraft returned to gate after right gear intransit light. Emergency equipment dispatched even though 3 green indication. The problem was with the gear handle up (right intransit). The uplock hook needed to be adjusted. A step that was missed during a landing gear change the night before. The step was overlooked and could have been prevented by a more substantial turnover between shifts. Callback conversation with reporter revealed the following information: the reporter stated that this type of fault occurs occasionally where the main gear is replaced and the hook is adjusted but in the air will get the gear unsafe light. The reporter said it may be caused by the air loads on the wing and landing gear moving the gear or hook out of adjustment and if this is the case the maintenance manual should be revised to allow greater adjustment limits. The reporter stated on this aircraft the gear was swung 10 times after replacement and tested good every cycle. The reporter said when the aircraft returned the hook adjustment required was a few thousanths of an inch. The reporter said the FAA has made contact.

Original NASA ASRS Text

Title: AN EMB120 IMMEDIATELY AFTER TKOF DECLARED AN EMER AND DIVERTED DUE TO THE R MAIN GEAR UNSAFE LIGHT ON WITH THE GEAR HANDLE UP CAUSED BY THE UPLOCK HOOK OUT OF ADJUSTMENT.

Narrative: ACFT RETURNED TO GATE AFTER R GEAR INTRANSIT LIGHT. EMER EQUIP DISPATCHED EVEN THOUGH 3 GREEN INDICATION. THE PROB WAS WITH THE GEAR HANDLE UP (R INTRANSIT). THE UPLOCK HOOK NEEDED TO BE ADJUSTED. A STEP THAT WAS MISSED DURING A LNDG GEAR CHANGE THE NIGHT BEFORE. THE STEP WAS OVERLOOKED AND COULD HAVE BEEN PREVENTED BY A MORE SUBSTANTIAL TURNOVER BTWN SHIFTS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THAT THIS TYPE OF FAULT OCCURS OCCASIONALLY WHERE THE MAIN GEAR IS REPLACED AND THE HOOK IS ADJUSTED BUT IN THE AIR WILL GET THE GEAR UNSAFE LIGHT. THE RPTR SAID IT MAY BE CAUSED BY THE AIR LOADS ON THE WING AND LNDG GEAR MOVING THE GEAR OR HOOK OUT OF ADJUSTMENT AND IF THIS IS THE CASE THE MAINT MANUAL SHOULD BE REVISED TO ALLOW GREATER ADJUSTMENT LIMITS. THE RPTR STATED ON THIS ACFT THE GEAR WAS SWUNG 10 TIMES AFTER REPLACEMENT AND TESTED GOOD EVERY CYCLE. THE RPTR SAID WHEN THE ACFT RETURNED THE HOOK ADJUSTMENT REQUIRED WAS A FEW THOUSANTHS OF AN INCH. THE RPTR SAID THE FAA HAS MADE CONTACT.

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.

An EMB120 immediately after takeoff declared an emergency and diverted due to the right main gear unsafe light on with the gear handle up caused by the uplock hook out of adjustment.