MD80 flight crew reports both compass systems fail after takeoff; 90 degrees off heading. Flight crew returns for VFR landing.

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Attributes
ACN	749212
Time
Date	200708
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : dfw.airport
State Reference	TX
Altitude	agl single value : 400
Environment
Flight Conditions	VMC
Light	Dawn
Aircraft 1
Controlling Facilities	tracon : d10.tracon
Operator	common carrier : air carrier
Make Model Name	MD-80 Series (DC-9-80) Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	climbout : initial ground : parked
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
ASRS Report	749212
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
ASRS Report	749217
Events
Anomaly	aircraft equipment problem : less severe other spatial deviation
Independent Detector	aircraft equipment other aircraft equipment : irs lights other flight crewa
Resolutory Action	other
Consequence	other
Supplementary
Problem Areas	Aircraft Flight Crew Human Performance
Primary Problem	Aircraft

Narrative:

On short taxi out; headings check ok. I did not check runway heading taking the runway; but captain says they checked ok. Immediately after takeoff; both compasses were 90 degrees off actual heading (dfw runway 17R departure; both headings reading 270 degrees). Both IRS att #1 and IRS att #2 blue lights on annunciator panel. Did not declare emergency. Return to dfw via visual approach to runway 17C. Maintenance unable to fix problem. Aircraft OTS. Changed equipment.

Original NASA ASRS Text

Title: MD80 FLT CREW REPORTS BOTH COMPASS SYSTEMS FAIL AFTER TKOF; 90 DEGREES OFF HEADING. FLT CREW RETURNS FOR VFR LANDING.

Narrative: ON SHORT TAXI OUT; HDGS CHK OK. I DID NOT CHK RWY HDG TAKING THE RWY; BUT CAPT SAYS THEY CHKED OK. IMMEDIATELY AFTER TKOF; BOTH COMPASSES WERE 90 DEGS OFF ACTUAL HDG (DFW RWY 17R DEP; BOTH HDGS READING 270 DEGS). BOTH IRS ATT #1 AND IRS ATT #2 BLUE LIGHTS ON ANNUNCIATOR PANEL. DID NOT DECLARE EMER. RETURN TO DFW VIA VISUAL APCH TO RWY 17C. MAINT UNABLE TO FIX PROB. ACFT OTS. CHANGED EQUIP.

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.