B747-200 pitches up and rolls right with loss of INS. Sudden roll injures flight attendant and fligh...

Attributes
ACN	342073
Time
Date	199607
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : yzp
State Reference	BC
Altitude	msl bound lower : 31000 msl bound upper : 31800
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : cyvr artcc : zob
Operator	common carrier : air carrier
Make Model Name	B747-100
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	cruise other other
Route In Use	enroute : direct
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : commercial pilot : instrument
Experience	flight time last 90 days : 150 flight time total : 9000 flight time type : 5000
ASRS Report	342073
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude other anomaly other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : overcame equipment problem flight crew : returned to intended course or assigned course flight crew : regained aircraft control
Consequence	other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

We were in cruise at FL310 on a flight from seattle to hong kong with the captain flying and the aircraft (B747-200) on the 'a' autoplt and pms and navigating via 3 abc INS units (#1 INS tied to 'a' autoplt) when we experienced a complete loss of the #1 INS. The loss was sudden, immediate and completely unexpected. The loss of the INS caused a violent upset of the 'a' autoplt resulting in a pitch up and roll right. The captain lost his primary instruments (his attitude gyro was upside down). He took control of the airplane immediately but we had already climbed to FL318. The captain passed control of the aircraft to me and I then leveled it back at FL310 and put the aircraft on the 'B' autoplt. A report was made to vancouver center concerning the loss of the INS and the resulting altitude transgression. An unfortunate result of the violent pitch and roll of the aircraft was an injury sustained by one of our flight attendants who was thrown backwards against the corner of a galley wall. She was in severe pain from the back injury. After an examination by a doctor and an emt who were onboard, the decision was made to divert to anchorage, so she could be removed from the flight and sent to a hospital. We notified vancouver center of the diversion, were cleared direct to anchorage, dumped approximately 90000 pounds of fuel, and landed without incident. The #1 INS was replaced in anchorage. We subsequently proceeded to hong king without further incident.

Original NASA ASRS Text

Title: B747-200 PITCHES UP AND ROLLS R WITH LOSS OF INS. SUDDEN ROLL INJURES FLT ATTENDANT AND FLC DIVERTS INTO ANC.

Narrative: WE WERE IN CRUISE AT FL310 ON A FLT FROM SEATTLE TO HONG KONG WITH THE CAPT FLYING AND THE ACFT (B747-200) ON THE 'A' AUTOPLT AND PMS AND NAVING VIA 3 ABC INS UNITS (#1 INS TIED TO 'A' AUTOPLT) WHEN WE EXPERIENCED A COMPLETE LOSS OF THE #1 INS. THE LOSS WAS SUDDEN, IMMEDIATE AND COMPLETELY UNEXPECTED. THE LOSS OF THE INS CAUSED A VIOLENT UPSET OF THE 'A' AUTOPLT RESULTING IN A PITCH UP AND ROLL R. THE CAPT LOST HIS PRIMARY INSTS (HIS ATTITUDE GYRO WAS UPSIDE DOWN). HE TOOK CTL OF THE AIRPLANE IMMEDIATELY BUT WE HAD ALREADY CLBED TO FL318. THE CAPT PASSED CTL OF THE ACFT TO ME AND I THEN LEVELED IT BACK AT FL310 AND PUT THE ACFT ON THE 'B' AUTOPLT. A RPT WAS MADE TO VANCOUVER CTR CONCERNING THE LOSS OF THE INS AND THE RESULTING ALT TRANSGRESSION. AN UNFORTUNATE RESULT OF THE VIOLENT PITCH AND ROLL OF THE ACFT WAS AN INJURY SUSTAINED BY ONE OF OUR FLT ATTENDANTS WHO WAS THROWN BACKWARDS AGAINST THE CORNER OF A GALLEY WALL. SHE WAS IN SEVERE PAIN FROM THE BACK INJURY. AFTER AN EXAMINATION BY A DOCTOR AND AN EMT WHO WERE ONBOARD, THE DECISION WAS MADE TO DIVERT TO ANCHORAGE, SO SHE COULD BE REMOVED FROM THE FLT AND SENT TO A HOSPITAL. WE NOTIFIED VANCOUVER CTR OF THE DIVERSION, WERE CLRED DIRECT TO ANCHORAGE, DUMPED APPROX 90000 LBS OF FUEL, AND LANDED WITHOUT INCIDENT. THE #1 INS WAS REPLACED IN ANCHORAGE. WE SUBSEQUENTLY PROCEEDED TO HONG KING WITHOUT FURTHER 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.

B747-200 pitches up and rolls right with loss of INS. Sudden roll injures flight attendant and flight crew diverts into anc.