C47 gear inadvertently raised on the ground when trying to correct high hydraulic pressure problem.

Attributes
ACN	475126
Time
Date	200006
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : rdg.airport
State Reference	PA
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : lax.tower
Operator	Other
Make Model Name	DC-3/Dakota/Skytrain
Operating Under FAR Part	Part 91
Flight Phase	ground : holding
Flight Plan	VFR
Person 1
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 45 flight time total : 9000 flight time type : 3400
ASRS Report	475126
Person 2
Affiliation	Other
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Experience	flight time last 90 days : 6 flight time total : 6500 flight time type : 1000
ASRS Report	474928
Events
Anomaly	aircraft equipment problem : critical non adherence : published procedure
Independent Detector	other flight crewa other flight crewb
Resolutory Action	aircraft : evacuated
Consequence	other other
Supplementary
Problem Areas	Flight Crew Human Performance Aircraft
Primary Problem	Flight Crew Human Performance

Narrative:

The landing gear pressure gauge indicated it was well above system limits. To reduce pressure on the ground you move the handle to the down position. It can also exceed pressure limits in-flight and to reduce pressure you raise handle from neutral to retract position. I advised copilot of high pressure and then inadvertently moved the handle to the up position. This caused right landing gear to retract which damaged right propeller, engine and right landing gear. Left gear did not retract. Corrective action to be taken: in future discuss with other crew member before moving handle when on the ground to make sure each one agrees with procedure and handle will move in right direction. Human performance factors: due the 2 different procedures to accomplish the same result it appears the brain can sometimes command the wrong action. Note: aircraft was holding short of runway with brake set at time of this incident.

Original NASA ASRS Text

Title: C47 GEAR INADVERTENTLY RAISED ON THE GND WHEN TRYING TO CORRECT HIGH HYD PRESSURE PROB.

Narrative: THE LNDG GEAR PRESSURE GAUGE INDICATED IT WAS WELL ABOVE SYS LIMITS. TO REDUCE PRESSURE ON THE GND YOU MOVE THE HANDLE TO THE DOWN POS. IT CAN ALSO EXCEED PRESSURE LIMITS INFLT AND TO REDUCE PRESSURE YOU RAISE HANDLE FROM NEUTRAL TO RETRACT POS. I ADVISED COPLT OF HIGH PRESSURE AND THEN INADVERTENTLY MOVED THE HANDLE TO THE UP POS. THIS CAUSED R LNDG GEAR TO RETRACT WHICH DAMAGED R PROP, ENG AND R LNDG GEAR. L GEAR DID NOT RETRACT. CORRECTIVE ACTION TO BE TAKEN: IN FUTURE DISCUSS WITH OTHER CREW MEMBER BEFORE MOVING HANDLE WHEN ON THE GND TO MAKE SURE EACH ONE AGREES WITH PROC AND HANDLE WILL MOVE IN RIGHT DIRECTION. HUMAN PERFORMANCE FACTORS: DUE THE 2 DIFFERENT PROCS TO ACCOMPLISH THE SAME RESULT IT APPEARS THE BRAIN CAN SOMETIMES COMMAND THE WRONG ACTION. NOTE: ACFT WAS HOLDING SHORT OF RWY WITH BRAKE SET AT TIME OF THIS INCIDENT.

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.