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B737-800 first officer reported that departing out of bwi; the aircraft is unable to make the 17000ft. Restriction at foxhl on terpz 6 departure.
| Attributes | |
| ACN | 1560763 |
| Time | |
| Date | 201807 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | BWI.Airport |
| State Reference | MD |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | B737-800 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Climb |
| Route In Use | SID TERPZ 6 |
| Flight Plan | IFR |
| Person 1 | |
| Function | First Officer Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine |
| Experience | Flight Crew Last 90 Days 230 Flight Crew Type 1600 |
| Events | |
| Anomaly | Deviation - Altitude Crossing Restriction Not Met Deviation - Procedural Published Material / Policy |
Narrative:
I have flown out of bwi on the terpz 6 to either ottto or ramay the last three weeks. Each time I have flown a 737-800 or MAX8. The first two times in the 737-800 we had to adjust our climb out speed below the econ schedule (which was around 300) to make the 17;000ft.; or above restriction at foxhl (FMC warnings were received 'unable next altitude'). In the 737 MAX8; it was less. So by starting early to adjust our profile we were able to meet the restriction. It appears like a trend that heavy 737-800 aircraft in summertime will have a hard time meeting the climb restriction; and if you do not catch it soon enough you may not make the foxhl restriction.[suggestion].in the departure section of the SID add a note. If departing the terpz 6 to ottto or ramay be aware that high gross weights and hot temperatures may not allow you to climb via the FMC econ speed and meet the 17;000ft.; or above restriction at foxhl.
Original NASA ASRS Text
Title: B737-800 First Officer reported that departing out of BWI; the aircraft is unable to make the 17000ft. restriction at FOXHL on TERPZ 6 departure.
Narrative: I have flown out of BWI on the TERPZ 6 to either OTTTO or RAMAY the last three weeks. Each time I have flown a 737-800 or MAX8. The first two times in the 737-800 we had to adjust our climb out speed below the ECON Schedule (which was around 300) to make the 17;000ft.; or above restriction at FOXHL (FMC warnings were received 'unable next altitude'). In the 737 MAX8; it was less. So by starting early to adjust our profile we were able to meet the restriction. It appears like a trend that heavy 737-800 aircraft in summertime will have a hard time meeting the climb restriction; and if you do not catch it soon enough you may not make the FOXHL restriction.[Suggestion].In the Departure Section of the SID add a note. If departing the TERPZ 6 to OTTTO or RAMAY be aware that high gross weights and hot temperatures may not allow you to climb via the FMC ECON Speed and meet the 17;000ft.; or above restriction at FOXHL.
Data retrieved from NASA's ASRS site 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.