B757 lost INS's on departure from bos. Continues raw data.

Attributes
ACN	437936
Time
Date	199904
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : bos.airport
State Reference	MA
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	climbout : takeoff climbout : initial
Route In Use	departure : other published ifr departure
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : flight engineer pilot : multi engine
Experience	flight time last 90 days : 200 flight time total : 8000 flight time type : 350
ASRS Report	437936
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : less severe non adherence : published procedure
Independent Detector	other flight crewa other other : 2
Resolutory Action	flight crew : overcame equipment problem
Supplementary
Problem Areas	Flight Crew Human Performance Aircraft
Primary Problem	Aircraft

Narrative:

On FMS departure, the INS's went inoperative on the takeoff roll, causing a loss of maps and CDU's. Had to make the altitude, DME for turn, and navigation on the departure with reference to raw data. Situation did not warrant a high speed abort at time of occurrence. We were able to continue flight using raw data. Departure never queried as to our turn on the departure (SID), we were within the tolerances using raw data backup.

Original NASA ASRS Text

Title: B757 LOST INS'S ON DEP FROM BOS. CONTINUES RAW DATA.

Narrative: ON FMS DEP, THE INS'S WENT INOP ON THE TKOF ROLL, CAUSING A LOSS OF MAPS AND CDU'S. HAD TO MAKE THE ALT, DME FOR TURN, AND NAV ON THE DEP WITH REF TO RAW DATA. SIT DID NOT WARRANT A HIGH SPD ABORT AT TIME OF OCCURRENCE. WE WERE ABLE TO CONTINUE FLT USING RAW DATA. DEP NEVER QUERIED AS TO OUR TURN ON THE DEP (SID), WE WERE WITHIN THE TOLERANCES USING RAW DATA BACKUP.

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.