Air carrier medium large transport crosses OM too low on GS inoperative ILS.

Attributes
ACN	149158
Time
Date	199006
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : ibur airport : bur
State Reference	CA
Altitude	msl bound lower : 1140 msl bound upper : 3000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : bur tower : bur
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	descent : approach
Route In Use	approach : straight in
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : commercial pilot : flight engineer pilot : instrument
Experience	flight time last 90 days : 180 flight time total : 14000 flight time type : 2000
ASRS Report	149159
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	altitude deviation : crossing restriction not met other anomaly other other spatial deviation
Independent Detector	other controllera
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

While on on ILS to runway 08 at bur with the G/south inoperative, and after switching to bur tower (which occurred prior to reaching MDA), tower advised us to check our altitude. All 3 altimeters showed above the MDA by 40' or more, we told bur tower we were above MDA (1140') with ground contact. After landing on runway 8 I found the marker beacon selected to high which may have caused us to start down from our OM crossing altitude slightly early, which would have caused our arrival at the MDA to be further from the end of the runway than normal. To prevent this from happening again, I will include the marker beacon switch in my approach briefing!

Original NASA ASRS Text

Title: ACR MLG CROSSES OM TOO LOW ON GS INOPERATIVE ILS.

Narrative: WHILE ON ON ILS TO RWY 08 AT BUR WITH THE G/S INOP, AND AFTER SWITCHING TO BUR TWR (WHICH OCCURRED PRIOR TO REACHING MDA), TWR ADVISED US TO CHK OUR ALT. ALL 3 ALTIMETERS SHOWED ABOVE THE MDA BY 40' OR MORE, WE TOLD BUR TWR WE WERE ABOVE MDA (1140') WITH GND CONTACT. AFTER LNDG ON RWY 8 I FOUND THE MARKER BEACON SELECTED TO HIGH WHICH MAY HAVE CAUSED US TO START DOWN FROM OUR OM XING ALT SLIGHTLY EARLY, WHICH WOULD HAVE CAUSED OUR ARR AT THE MDA TO BE FURTHER FROM THE END OF THE RWY THAN NORMAL. TO PREVENT THIS FROM HAPPENING AGAIN, I WILL INCLUDE THE MARKER BEACON SWITCH IN MY APCH BRIEFING!

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.