Gear door isolation valve pinned, unable to raise gear.

Attributes
ACN	166352
Time
Date	199012
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : cak
State Reference	OH
Altitude	agl bound lower : 1500 agl bound upper : 1500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : cak tower : cak
Operator	common carrier : air carrier
Make Model Name	Medium Transport, Low Wing, 2 Turboprop Eng
Flight Phase	climbout : initial
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 180 flight time total : 2100
ASRS Report	166352
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 230 flight time total : 2435
ASRS Report	166521
Events
Anomaly	aircraft equipment problem : less severe non adherence : published procedure
Independent Detector	other flight crewa
Resolutory Action	other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Ahrs #2 failed on ground in cak. Maintenance drove from cle and replaced the unit. We were redispatched as flight #XXX, no passenger. On preflight (maintenance filling out logbook) I noted the hydraulic compartment door (right nose) slightly ajar, gear door isolation valve still pinned. After maintenance departed I rechked the door from the nose it appeared to be closed. I believed maintenance had completed their procedure. We departed cak, on selection of gear up heard a continuous loud noise and returned to ck. Post flight revealed compartment door still ajar, valve pinned and nose gear doors open (source of the noise). At no time was IAS in excess of 155 KTS. No emergency was declared. This could have been prevented by changing the maintenance procedure to include attaching a red 'remove before flight' streamer to the isolation valve handle, thereby making the unsecured condition more easily detectable.

Original NASA ASRS Text

Title: GEAR DOOR ISOLATION VALVE PINNED, UNABLE TO RAISE GEAR.

Narrative: AHRS #2 FAILED ON GND IN CAK. MAINT DROVE FROM CLE AND REPLACED THE UNIT. WE WERE REDISPATCHED AS FLT #XXX, NO PAX. ON PREFLT (MAINT FILLING OUT LOGBOOK) I NOTED THE HYD COMPARTMENT DOOR (R NOSE) SLIGHTLY AJAR, GEAR DOOR ISOLATION VALVE STILL PINNED. AFTER MAINT DEPARTED I RECHKED THE DOOR FROM THE NOSE IT APPEARED TO BE CLOSED. I BELIEVED MAINT HAD COMPLETED THEIR PROC. WE DEPARTED CAK, ON SELECTION OF GEAR UP HEARD A CONTINUOUS LOUD NOISE AND RETURNED TO CK. POST FLT REVEALED COMPARTMENT DOOR STILL AJAR, VALVE PINNED AND NOSE GEAR DOORS OPEN (SOURCE OF THE NOISE). AT NO TIME WAS IAS IN EXCESS OF 155 KTS. NO EMER WAS DECLARED. THIS COULD HAVE BEEN PREVENTED BY CHANGING THE MAINT PROC TO INCLUDE ATTACHING A RED 'REMOVE BEFORE FLT' STREAMER TO THE ISOLATION VALVE HANDLE, THEREBY MAKING THE UNSECURED CONDITION MORE EASILY DETECTABLE.

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.