Captain's navigation and attitude instruments failed enroute. Continued to destination.

Attributes
ACN	148332
Time
Date	199006
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : msy airport : pbi
State Reference	LA
Altitude	msl bound lower : 37000 msl bound upper : 37000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zhu
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 250 flight time total : 26000 flight time type : 3000
ASRS Report	148332
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : cfi pilot : instrument pilot : flight engineer pilot : commercial pilot : atp
Experience	flight time last 90 days : 140 flight time total : 4500 flight time type : 140
ASRS Report	147825
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	atc equipment other atc equipment : unspecified other flight crewa
Resolutory Action	none taken : anomaly accepted
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

En route iah pbi abeam msy both IRS dc fail lights illuminated. After consultation with company mx via phone patch convinced by mx just a glitch 'continue on to pbi' 100 mi west of tpa captain's flight instruments related to IRS's started to fail one by one. Battery voltage now showing a drop from normal. ATC notified and proceeded to land at pbi with first officer flight instruments. (Pbi nearest airport in point of time). WX VFR, all preflight checks were completed. Post flight inspection revealed battery circuit breaker and battery charger circuit breaker tripped. Supplemental information from acn 147825. 100 NM west of srq, battery voltage dropped to 18 volts. Another phone patch to mx, mother 'continue to pbi' shortly after passing tpa, captain's flight instruments, related to IRS's, failed, and ATC was notified.

Original NASA ASRS Text

Title: CAPT'S NAVIGATION AND ATTITUDE INSTRUMENTS FAILED ENROUTE. CONTINUED TO DESTINATION.

Narrative: ENRTE IAH PBI ABEAM MSY BOTH IRS DC FAIL LIGHTS ILLUMINATED. AFTER CONSULTATION WITH COMPANY MX VIA PHONE PATCH CONVINCED BY MX JUST A GLITCH 'CONTINUE ON TO PBI' 100 MI W OF TPA CAPT'S FLT INSTRUMENTS RELATED TO IRS'S STARTED TO FAIL ONE BY ONE. BATTERY VOLTAGE NOW SHOWING A DROP FROM NORMAL. ATC NOTIFIED AND PROCEEDED TO LAND AT PBI WITH F/O FLT INSTRUMENTS. (PBI NEAREST ARPT IN POINT OF TIME). WX VFR, ALL PREFLT CHKS WERE COMPLETED. POST FLT INSPECTION REVEALED BATTERY CB AND BATTERY CHARGER CB TRIPPED. SUPPLEMENTAL INFO FROM ACN 147825. 100 NM W OF SRQ, BATTERY VOLTAGE DROPPED TO 18 VOLTS. ANOTHER PHONE PATCH TO MX, MOTHER 'CONTINUE TO PBI' SHORTLY AFTER PASSING TPA, CAPT'S FLT INSTRUMENTS, RELATED TO IRS'S, FAILED, AND ATC WAS NOTIFIED.

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.