Cargo shifted on takeoff damaging aft bulkhead.

Attributes
ACN	295050
Time
Date	199501
Place
Locale Reference	airport : yip
State Reference	MI
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tower : yip
Operator	common carrier : air carrier
Make Model Name	B747-C/F
Operating Under FAR Part	Part 121
Flight Phase	climbout : takeoff
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 11 flight time total : 9000 flight time type : 11
ASRS Report	295050
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	other other : unspecified
Resolutory Action	none taken : detected after the fact other
Consequence	other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Part 91 flight to repos from yip to dtw for cargo pick-up. 2 stacks of empty pallets were 'secured' on forward cargo deck. Left stack -- 5000 pounds. Slid aft -- probably at rotation -- coming to rest against aft pressure bulkhead. Breaking up upon impact with the aft stops, pallets in the stack punched large holes in the aft bulkhead. Takeoff to landing was 15 mins. The flight was normal in all respects. The damage was discovered by ground. Handlers at dtw. The pallets were secure when the aircraft arrived at yip the day before. I was a part of that crew. Maintenance was performed during the day at yip and the subject stack was probably moved and then replaced without being locked in place. Irregular alignment of some 18250 pound pallets in the stack helped obscure the aft RAIL locks from direct observation. Assumption of pallet security and cursory examination of locks contributed.

Original NASA ASRS Text

Title: CARGO SHIFTED ON TKOF DAMAGING AFT BULKHEAD.

Narrative: PART 91 FLT TO REPOS FROM YIP TO DTW FOR CARGO PICK-UP. 2 STACKS OF EMPTY PALLETS WERE 'SECURED' ON FORWARD CARGO DECK. L STACK -- 5000 LBS. SLID AFT -- PROBABLY AT ROTATION -- COMING TO REST AGAINST AFT PRESSURE BULKHEAD. BREAKING UP UPON IMPACT WITH THE AFT STOPS, PALLETS IN THE STACK PUNCHED LARGE HOLES IN THE AFT BULKHEAD. TKOF TO LNDG WAS 15 MINS. THE FLT WAS NORMAL IN ALL RESPECTS. THE DAMAGE WAS DISCOVERED BY GND. HANDLERS AT DTW. THE PALLETS WERE SECURE WHEN THE ACFT ARRIVED AT YIP THE DAY BEFORE. I WAS A PART OF THAT CREW. MAINT WAS PERFORMED DURING THE DAY AT YIP AND THE SUBJECT STACK WAS PROBABLY MOVED AND THEN REPLACED WITHOUT BEING LOCKED IN PLACE. IRREGULAR ALIGNMENT OF SOME 18250 LB PALLETS IN THE STACK HELPED OBSCURE THE AFT RAIL LOCKS FROM DIRECT OBSERVATION. ASSUMPTION OF PALLET SECURITY AND CURSORY EXAMINATION OF LOCKS CONTRIBUTED.

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.