 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
B737 first officer reports that FMC database for phl has only a single ILS runway 9R approach while the aeronautical charts include an additional 'converging' ILS. Notes that minimums and missed approach differ.
| Attributes | |
| ACN | 640967 |
| Time | |
| Date | 200412 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : phl.airport |
| State Reference | PA |
| Aircraft 1 | |
| Controlling Facilities | tracon : phl.tracon tower : phl.tower |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | descent : approach landing : missed approach |
| Route In Use | approach : instrument precision |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Experience | flight time total : 3700 flight time type : 800 |
| ASRS Report | 640967 |
| Events | |
| Anomaly | aircraft equipment problem : less severe non adherence : published procedure other anomaly other other spatial deviation |
| Independent Detector | other flight crewa |
| Resolutory Action | other |
| Supplementary | |
| Problem Areas | Aircraft Company |
| Primary Problem | Aircraft |
| Situations | |
| Chart | airport : phl.airport approach : converging ils rwy 9r |
Narrative:
Subject: FMC database approach plates differences at phl. Our approach plates have 2 ILS runway 9R's to phl, 11-2 and 11-3, the ILS runway 9R and converging ILS runway 9R. They have different missed approach procedures and minimums. The FMC database only contains 1 ILS runway 9R, which is the ILS runway 9R with its missed (not the converging). The standard ILS runway 9R (11-2) missed approach procedure is above 1500 ft right 3000 ft while the converging (11-3) missed is right 3000 ft, so as to avoid the approach corridor for runway 17/35. The converging decision altitude is sooner -- 621 ft versus 222 ft for standard ILS. Problem is, if a crew did an LNAV missed off the converging ILS runway 9R, the FMC course would have the aircraft climb straight ahead to 1500 ft before turning, versus the immediate right that is called for, thus, possibly impinging on the runway 17/35 corridor. Suggestion: either 1) add a converging ILS runway 9R to FMC database or, 2) expand the note on 10-7 so that it makes it clear the FMC contains the regular ILS missed, not the converging missed and recommend using heading select or autoplt off, but not LNAV for the missed. P.south. I will also submit an irregularity report. Wasn't sure which was more appropriate. Callback conversation with reporter revealed the following information: reporter advised the company was aware of the issue and had addressed it in their in-house pubs.
Original NASA ASRS Text
Title: B737 FO RPTS THAT FMC DATABASE FOR PHL HAS ONLY A SINGLE ILS RWY 9R APCH WHILE THE AERO CHARTS INCLUDE AN ADDITIONAL 'CONVERGING' ILS. NOTES THAT MINIMUMS AND MISSED APCH DIFFER.
Narrative: SUBJECT: FMC DATABASE APCH PLATES DIFFERENCES AT PHL. OUR APCH PLATES HAVE 2 ILS RWY 9R'S TO PHL, 11-2 AND 11-3, THE ILS RWY 9R AND CONVERGING ILS RWY 9R. THEY HAVE DIFFERENT MISSED APCH PROCS AND MINIMUMS. THE FMC DATABASE ONLY CONTAINS 1 ILS RWY 9R, WHICH IS THE ILS RWY 9R WITH ITS MISSED (NOT THE CONVERGING). THE STANDARD ILS RWY 9R (11-2) MISSED APCH PROC IS ABOVE 1500 FT RIGHT 3000 FT WHILE THE CONVERGING (11-3) MISSED IS RIGHT 3000 FT, SO AS TO AVOID THE APCH CORRIDOR FOR RWY 17/35. THE CONVERGING DECISION ALT IS SOONER -- 621 FT VERSUS 222 FT FOR STANDARD ILS. PROB IS, IF A CREW DID AN LNAV MISSED OFF THE CONVERGING ILS RWY 9R, THE FMC COURSE WOULD HAVE THE ACFT CLB STRAIGHT AHEAD TO 1500 FT BEFORE TURNING, VERSUS THE IMMEDIATE R THAT IS CALLED FOR, THUS, POSSIBLY IMPINGING ON THE RWY 17/35 CORRIDOR. SUGGESTION: EITHER 1) ADD A CONVERGING ILS RWY 9R TO FMC DATABASE OR, 2) EXPAND THE NOTE ON 10-7 SO THAT IT MAKES IT CLR THE FMC CONTAINS THE REGULAR ILS MISSED, NOT THE CONVERGING MISSED AND RECOMMEND USING HDG SELECT OR AUTOPLT OFF, BUT NOT LNAV FOR THE MISSED. P.S. I WILL ALSO SUBMIT AN IRREGULARITY RPT. WASN'T SURE WHICH WAS MORE APPROPRIATE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR ADVISED THE COMPANY WAS AWARE OF THE ISSUE AND HAD ADDRESSED IT IN THEIR IN-HOUSE PUBS.
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.