B737-300 during 'B' check with the engine cowling open hydraulic power was put on the airplane and the leading edge devices lowered damaging the cowling.

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Attributes
ACN	657514
Time
Date	200505
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Person 1
Affiliation	company : air carrier
Function	maintenance : technician
Qualification	technician : powerplant technician : airframe
ASRS Report	657514
Person 2
Affiliation	company : air carrier
Function	maintenance : lead technician
Events
Anomaly	aircraft equipment problem : critical maintenance problem : improper maintenance maintenance problem : improper documentation non adherence : published procedure non adherence : far
Independent Detector	other other : 1
Resolutory Action	none taken : detected after the fact
Consequence	other other other
Factors
Maintenance	contributing factor : work cards performance deficiency : non compliance with legal requirements performance deficiency : scheduled maintenance performance deficiency : inspection
Supplementary
Problem Areas	Environmental Factor Maintenance Human Performance Aircraft Chart Or Publication
Primary Problem	Maintenance Human Performance

Narrative:

After aircraft was pulled into the hangar; I was asked to turn on hydraulic power and continue my work in the cabin area. The lead technician asked me to do this. They were doing an 'east/C' [tap check; tapping engine cowling checking honeycomb] tap check. About 20 mins; when the lead asked me to shut off hydraulics; a function mechanic volunteered to go into the cockpit and turn off hydraulics; but I failed to inform him that pumps were still 'on.' it was very noisy due to opening up (screw knocked) drills; etc. The leading edge flaps were deployed; thus hitting the inboard engine cowls; causing the damage.

Original NASA ASRS Text

Title: B737-300 DURING 'B' CHK WITH THE ENG COWLING OPEN HYD PWR WAS PUT ON THE AIRPLANE AND THE LEADING EDGE DEVICES LOWERED DAMAGING THE COWLING.

Narrative: AFTER ACFT WAS PULLED INTO THE HANGAR; I WAS ASKED TO TURN ON HYD PWR AND CONTINUE MY WORK IN THE CABIN AREA. THE LEAD TECHNICIAN ASKED ME TO DO THIS. THEY WERE DOING AN 'E/C' [TAP CHK; TAPPING ENG COWLING CHKING HONEYCOMB] TAP CHK. ABOUT 20 MINS; WHEN THE LEAD ASKED ME TO SHUT OFF HYDS; A FUNCTION MECH VOLUNTEERED TO GO INTO THE COCKPIT AND TURN OFF HYDS; BUT I FAILED TO INFORM HIM THAT PUMPS WERE STILL 'ON.' IT WAS VERY NOISY DUE TO OPENING UP (SCREW KNOCKED) DRILLS; ETC. THE LEADING EDGE FLAPS WERE DEPLOYED; THUS HITTING THE INBOARD ENG COWLS; CAUSING THE DAMAGE.

Data retrieved from NASA's ASRS site as of January 2009 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.