An air carrier medium large transport found itself low on the localizer.

Attributes
ACN	269986
Time
Date	199404
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : san
State Reference	CA
Altitude	msl bound lower : 1500 msl bound upper : 2000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer & glide slope : iubr
Flight Phase	descent : approach
Route In Use	approach : straight in arrival 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 : 200 flight time total : 9900 flight time type : 2000
ASRS Report	269986
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : less severe inflight encounter other non adherence : published procedure other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Primary Problem	Navigational Facility
Air Traffic Incident	other
Situations
ATC Facility	procedure or policy : unspecified

Narrative:

On localizer 27 approach to san, aircraft was level and configured for landing outside of reebo. At 6.4 localizer DME, we started a 1500 FPM descent. At 1500 ft MSL, FMA flashed ILS and localizer DME jumped up to 6.8 DME. We stopped descent and continued approach under visual conditions to a safe landing. We advised ATC of localizer/DME problems. They responded that they do not need to maintain a sterile approach during VFR WX.

Original NASA ASRS Text

Title: AN ACR MLG FOUND ITSELF LOW ON THE LOC.

Narrative: ON LOC 27 APCH TO SAN, ACFT WAS LEVEL AND CONFIGURED FOR LNDG OUTSIDE OF REEBO. AT 6.4 LOC DME, WE STARTED A 1500 FPM DSCNT. AT 1500 FT MSL, FMA FLASHED ILS AND LOC DME JUMPED UP TO 6.8 DME. WE STOPPED DSCNT AND CONTINUED APCH UNDER VISUAL CONDITIONS TO A SAFE LNDG. WE ADVISED ATC OF LOC/DME PROBS. THEY RESPONDED THAT THEY DO NOT NEED TO MAINTAIN A STERILE APCH DURING VFR WX.

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.