Air carrier widebody transport returned to lgw for overweight landing because a second INS failed as they were climbing west bound and they were not legal to continue into the organized atlantic track area with only one INS.

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Attributes
ACN	180898
Time
Date	199106
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : lgw
State Reference	FO
Altitude	msl bound lower : 20000 msl bound upper : 20000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : egtt artcc : zkc
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 4 Turbojet Eng
Navigation In Use	Other
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 12800 flight time type : 550
ASRS Report	180898
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 8000 flight time type : 2000
ASRS Report	180637
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	other flight crewa
Resolutory Action	none taken : unable
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

After takeoff with one INS (out of 3) inoperative, a position check showed one additional INS to be functionally inoperative. Not legal to enter nmps route structure with only one functioning INS so return to egkk performed. Overweight landing accomplished smoothly with no adverse effects. After overweight landing inspection and replacement of INS unit aircraft proceeded egkk-kewr with no further incident.

Original NASA ASRS Text

Title: ACR WDB RETURNED TO LGW FOR OVERWEIGHT LNDG BECAUSE A SECOND INS FAILED AS THEY WERE CLBING WEST BOUND AND THEY WERE NOT LEGAL TO CONTINUE INTO THE ORGANIZED ATLANTIC TRACK AREA WITH ONLY ONE INS.

Narrative: AFTER TKOF WITH ONE INS (OUT OF 3) INOP, A POS CHK SHOWED ONE ADDITIONAL INS TO BE FUNCTIONALLY INOP. NOT LEGAL TO ENTER NMPS RTE STRUCTURE WITH ONLY ONE FUNCTIONING INS SO RETURN TO EGKK PERFORMED. OVERWEIGHT LNDG ACCOMPLISHED SMOOTHLY WITH NO ADVERSE EFFECTS. AFTER OVERWEIGHT LNDG INSPECTION AND REPLACEMENT OF INS UNIT ACFT PROCEEDED EGKK-KEWR WITH NO 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.