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An air carrier cargo flight loses its altitude capture capability at 700 ft MSL on runway 27 localizer approach during an autoplt malfunction with the first officer flying 'below a normal glide path' from MDA to touchdown at san, ca.
| Attributes | |
| ACN | 504450 |
| Time | |
| Date | 200003 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : san.airport |
| State Reference | CA |
| Altitude | agl bound lower : 0 agl bound upper : 700 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : san.tower |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 3 Turbojet Eng |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | ils localizer only : 27 |
| Flight Phase | descent : vacating altitude |
| Route In Use | approach : instrument precision |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : instrument pilot : flight engineer pilot : atp pilot : commercial pilot : multi engine |
| Experience | flight time last 90 days : 100 flight time total : 11000 flight time type : 400 |
| ASRS Report | 504450 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 120 flight time total : 9000 flight time type : 1000 |
| ASRS Report | 504582 |
| Events | |
| Anomaly | aircraft equipment problem : less severe non adherence : company policies non adherence : far non adherence : published procedure other anomaly other anomaly |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : regained aircraft control |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Aircraft |
| Primary Problem | Aircraft |
Narrative:
While making the san runway 27 localizer approach with autoplt coupled, we lost the altitude arm/capture function of the FGS at the MDA (approximately 700 ft MSL). The problem was noted as we went 60 ft below MDA, where the PF disconnected the autoplt and arrested the descent. The last 2 mi of the final approach were inadvertently flown below a normal glide path. No further problems were encountered.
Original NASA ASRS Text
Title: AN ACR CARGO FLT LOSES ITS ALT CAPTURE CAPABILITY AT 700 FT MSL ON RWY 27 LOC APCH DURING AN AUTOPLT MALFUNCTION WITH THE FO FLYING 'BELOW A NORMAL GLIDE PATH' FROM MDA TO TOUCHDOWN AT SAN, CA.
Narrative: WHILE MAKING THE SAN RWY 27 LOC APCH WITH AUTOPLT COUPLED, WE LOST THE ALT ARM/CAPTURE FUNCTION OF THE FGS AT THE MDA (APPROX 700 FT MSL). THE PROB WAS NOTED AS WE WENT 60 FT BELOW MDA, WHERE THE PF DISCONNECTED THE AUTOPLT AND ARRESTED THE DSCNT. THE LAST 2 MI OF THE FINAL APCH WERE INADVERTENTLY FLOWN BELOW A NORMAL GLIDE PATH. NO FURTHER PROBS WERE ENCOUNTERED.
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.