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Air carrier large transport altitude deviation descended below glide slope outside the outer marker on IAP ILS approach into phl.
| Attributes | |
| ACN | 153202 |
| Time | |
| Date | 199007 |
| Day | Sun |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | airport : phl |
| State Reference | PA |
| Altitude | msl bound lower : 1550 msl bound upper : 1550 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : phl artcc : zid |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 210 flight time total : 18300 flight time type : 675 |
| ASRS Report | 153202 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : overshoot altitude deviation : excursion from assigned altitude non adherence : published procedure non adherence : clearance other spatial deviation |
| Independent Detector | atc equipment other atc equipment : unspecified |
| Resolutory Action | flight crew : returned to intended course or assigned course other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
First officer flying the ILS runway 27R at phl apparently misinterpreted the F/D and descended well below G/south before actual G/south intercept. Captain was distraction doing landing checklist and making frequency changes, consequently not monitoring first officer's flying. Approach control called and said we showed a 'low alert'. We returned to the G/south and continued to a normal approach and landing. Lesson learned: PNF must continually monitor flight instruments and aircraft performance at all times, particularly on departures and all approachs.
Original NASA ASRS Text
Title: ACR LGT ALT DEVIATION DESCENDED BELOW GLIDE SLOPE OUTSIDE THE OUTER MARKER ON IAP ILS APCH INTO PHL.
Narrative: F/O FLYING THE ILS RWY 27R AT PHL APPARENTLY MISINTERPRETED THE F/D AND DSNDED WELL BELOW G/S BEFORE ACTUAL G/S INTERCEPT. CAPT WAS DISTR DOING LNDG CHKLIST AND MAKING FREQ CHANGES, CONSEQUENTLY NOT MONITORING F/O'S FLYING. APCH CTL CALLED AND SAID WE SHOWED A 'LOW ALERT'. WE RETURNED TO THE G/S AND CONTINUED TO A NORMAL APCH AND LNDG. LESSON LEARNED: PNF MUST CONTINUALLY MONITOR FLT INSTRUMENTS AND ACFT PERFORMANCE AT ALL TIMES, PARTICULARLY ON DEPS AND ALL APCHS.
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.