MD11 crew experienced map shift departing egkk.

Attributes
ACN	534084
Time
Date	200112
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : egkk.airport
State Reference	FO
Altitude	msl single value : 1000
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	tracon : egkk.tracon
Operator	common carrier : air carrier
Make Model Name	MD-11
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	climbout : intermediate altitude
Route In Use	departure : on vectors departure sid : n/s
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : cfi pilot : atp
Experience	flight time last 90 days : 250 flight time total : 20000 flight time type : 250
ASRS Report	534084
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 100 flight time total : 4000 flight time type : 220
ASRS Report	534447
Events
Anomaly	aircraft equipment problem : less severe other spatial deviation
Independent Detector	aircraft equipment other aircraft equipment : raw data nav other flight crewa other flight crewb
Resolutory Action	flight crew : returned to original clearance
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

On takeoff from lgw, experienced a map shift which commanded aircraft to turn further right than necessary for navigation intercept. Went to heading select and immediately returned back to proper course. Supplemental information from acn 534447: took off from lgw on SID. Experienced a navigation map shift. Flight directors indicated a right turn to intercept departure radial. Captain followed flight director. When problem detected, captain immediately turned left to reintercept correct radial and departure. Switched to departure frequency and received vectors. No conflict occurred. Total deviation less than 1 mi.

Original NASA ASRS Text

Title: MD11 CREW EXPERIENCED MAP SHIFT DEPARTING EGKK.

Narrative: ON TKOF FROM LGW, EXPERIENCED A MAP SHIFT WHICH COMMANDED ACFT TO TURN FURTHER R THAN NECESSARY FOR NAV INTERCEPT. WENT TO HDG SELECT AND IMMEDIATELY RETURNED BACK TO PROPER COURSE. SUPPLEMENTAL INFO FROM ACN 534447: TOOK OFF FROM LGW ON SID. EXPERIENCED A NAV MAP SHIFT. FLT DIRECTORS INDICATED A R TURN TO INTERCEPT DEP RADIAL. CAPT FOLLOWED FLT DIRECTOR. WHEN PROB DETECTED, CAPT IMMEDIATELY TURNED L TO REINTERCEPT CORRECT RADIAL AND DEP. SWITCHED TO DEP FREQ AND RECEIVED VECTORS. NO CONFLICT OCCURRED. TOTAL DEV LESS THAN 1 MI.

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.