While on approach vectors; an A320 map function failed with operating nd's so the stby navigation mo...

Attributes
ACN	988896
Time
Date	201201
Environment
Flight Conditions	IMC
Aircraft 1
Make Model Name	A320
Operating Under FAR Part	Part 121
Flight Phase	Initial Approach
Flight Plan	IFR
Component
Aircraft Component	Position Computing System
Person 1
Function	Pilot Flying Captain
Experience	Flight Crew Last 90 Days 250 Flight Crew Total 10000 Flight Crew Type 5000
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

Lost nav capability on downwind ILS 34. IFR ceiling 500 ft visibility 1.5 miles. Went to stby navigation mode; manually tuned ILS's while on base. Got intercept vector. Localizer did not engage; was still 15 miles out. Got re-vectored; did manual hand flown ILS. Localizer was squirrelly. Uneventful landing. Got left/G system disagree ECAM during taxi in.

Original NASA ASRS Text

Title: While on approach vectors; an A320 Map function failed with operating ND's so the STBY NAV Mode was selected; the ILS tuned; and the approach flown raw data to a successful landing. The systems reset after the aircraft was powered down at the gate.

Narrative: Lost nav capability on downwind ILS 34. IFR ceiling 500 FT visibility 1.5 miles. Went to STBY NAV Mode; manually tuned ILS's while on base. Got intercept vector. LOC did not engage; was still 15 miles out. Got re-vectored; did manual hand flown ILS. LOC was squirrelly. Uneventful landing. Got L/G SYSTEM DISAGREE ECAM during taxi in.

Data retrieved from NASA's ASRS site as of July 2013 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.

While on approach vectors; an A320 map function failed with operating nd's so the stby navigation mode was selected; the ILS tuned; and the approach flown raw data to a successful landing. The systems reset after the aircraft was powered down at the gate.