An air carrier medium large transport's landing gear would not retract.

Attributes
ACN	275903
Time
Date	199406
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : pit
State Reference	PA
Altitude	agl bound lower : 0 agl bound upper : 1000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tower : pit
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	climbout : takeoff ground : preflight other
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 240 flight time total : 12000 flight time type : 9000
ASRS Report	275903
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : less severe other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	none taken : unable other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

We had a quick aircraft change in pit. The first officer preflted the outside while I checked the inside and discussed previous write-ups with a mechanic who had just completed work on #2 brake, after preflight, we performed receiving, before start, after start, and before takeoff checklists. After takeoff, gear handle was raised but gear did not retract. We performed abnormal checklist during vectors for return to the airport. The book said that, in our present condition (gear handle now down, 3 green lights, 1 yellow gear door open light on), it was necessary to pull emergency gear handle and let the doors 'fly' without hydraulic pressure on them to lessen damage on contact with the runway. Normal landing was accomplished and maintenance got doors up and pinned. At the gate, director of maintenance said that a hydraulic control in the left wheel well was in bypass, contrary to normal position. The first officer, who is a very conscientious person, distinctly remembered preflting both wheel wells. In addition, taxi out was completely normal (no yellow lights, steering and braking normal). The investigation was continuing as we left on a replacement aircraft.

Original NASA ASRS Text

Title: AN ACR MLG'S LNDG GEAR WOULD NOT RETRACT.

Narrative: WE HAD A QUICK ACFT CHANGE IN PIT. THE FO PREFLTED THE OUTSIDE WHILE I CHKED THE INSIDE AND DISCUSSED PREVIOUS WRITE-UPS WITH A MECH WHO HAD JUST COMPLETED WORK ON #2 BRAKE, AFTER PREFLT, WE PERFORMED RECEIVING, BEFORE START, AFTER START, AND BEFORE TKOF CHKLISTS. AFTER TKOF, GEAR HANDLE WAS RAISED BUT GEAR DID NOT RETRACT. WE PERFORMED ABNORMAL CHKLIST DURING VECTORS FOR RETURN TO THE ARPT. THE BOOK SAID THAT, IN OUR PRESENT CONDITION (GEAR HANDLE NOW DOWN, 3 GREEN LIGHTS, 1 YELLOW GEAR DOOR OPEN LIGHT ON), IT WAS NECESSARY TO PULL EMER GEAR HANDLE AND LET THE DOORS 'FLY' WITHOUT HYD PRESSURE ON THEM TO LESSEN DAMAGE ON CONTACT WITH THE RWY. NORMAL LNDG WAS ACCOMPLISHED AND MAINT GOT DOORS UP AND PINNED. AT THE GATE, DIRECTOR OF MAINT SAID THAT A HYD CTL IN THE L WHEEL WELL WAS IN BYPASS, CONTRARY TO NORMAL POS. THE FO, WHO IS A VERY CONSCIENTIOUS PERSON, DISTINCTLY REMEMBERED PREFLTING BOTH WHEEL WELLS. IN ADDITION, TAXI OUT WAS COMPLETELY NORMAL (NO YELLOW LIGHTS, STEERING AND BRAKING NORMAL). THE INVESTIGATION WAS CONTINUING AS WE LEFT ON A REPLACEMENT ACFT.

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.