B757 lost HSI, ADI, and FMC after takeoff. Flight crew returned to land at departure airport.

Attributes
ACN	348919
Time
Date	199609
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : mia
State Reference	FL
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : mia
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	climbout : intermediate altitude climbout : initial
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
ASRS Report	348919
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	348741
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : declared emergency none taken : unable
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

Due to a bent tow bar we had a ground delay of approximately 1 hour. During taxi out we noticed a map shift on the HSI, probably due to the long delay. While in position and hold the captain did a quick align on the IRU. Shortly after takeoff we lost the ADI, HSI, and FMC. The captain notified ATC and requested a VFR return to the field. ATC radar vectored us back to runway 9R where an uneventful approach and landing was accomplished using raw data. After additional mechanical problems developed, the aircraft was removed from service.

Original NASA ASRS Text

Title: B757 LOST HSI, ADI, AND FMC AFTER TKOF. FLC RETURNED TO LAND AT DEP ARPT.

Narrative: DUE TO A BENT TOW BAR WE HAD A GND DELAY OF APPROX 1 HR. DURING TAXI OUT WE NOTICED A MAP SHIFT ON THE HSI, PROBABLY DUE TO THE LONG DELAY. WHILE IN POS AND HOLD THE CAPT DID A QUICK ALIGN ON THE IRU. SHORTLY AFTER TKOF WE LOST THE ADI, HSI, AND FMC. THE CAPT NOTIFIED ATC AND REQUESTED A VFR RETURN TO THE FIELD. ATC RADAR VECTORED US BACK TO RWY 9R WHERE AN UNEVENTFUL APCH AND LNDG WAS ACCOMPLISHED USING RAW DATA. AFTER ADDITIONAL MECHANICAL PROBS DEVELOPED, THE ACFT WAS REMOVED FROM SVC.

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.