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B737-800 flight crew reported noticing longitudinal instability after takeoff and on approach after being advised by load planning they were loaded using 'extended cg envelope' procedures.
| Attributes | |
| ACN | 1271542 |
| Time | |
| Date | 201506 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Aircraft 1 | |
| Make Model Name | B737-800 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Takeoff |
| Flight Plan | IFR |
| Person 1 | |
| Function | Captain Pilot Flying |
| Person 2 | |
| Function | Pilot Not Flying First Officer |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Deviation - Procedural Published Material / Policy Deviation - Procedural Weight And Balance |
Narrative:
MEL had cargo restriction ...no fwd cargo.[computer] had 2;900 lbs showing fwd. I called load agent to ensure no cargo would be loaded forward the agent said they could extend the envelope to accommodate the .1 aft cg problem. I wound up with 3;400 lbs in the aft cargo.[computer] called for reduced power T/O.I decided to go max power 5' flaps.the aircraft was longitudinally unstable after takeoff. It required a lot of fwd then aft trim continuously.cruise was uneventful.during the practice CAT 111 an extraordinary amount of force and movement was required to keep the HUD presentation within the proper parameters to continue the approach.at 200 feet 'no A111' illuminated. The approach was continued.the landing was uneventful.I did not know the cg envelope could be extended to accommodate a cg problem however I strongly recommend against this practice if what I experienced is an example of extending the envelope.
Original NASA ASRS Text
Title: B737-800 flight crew reported noticing longitudinal instability after takeoff and on approach after being advised by load planning they were loaded using 'extended CG envelope' procedures.
Narrative: MEL had cargo restriction ...no fwd cargo.[Computer] had 2;900 lbs showing FWD. I called load agent to ensure no cargo would be loaded forward the agent said they could extend the Envelope to accommodate the .1 aft cg problem. I wound up with 3;400 lbs in the aft cargo.[Computer] called for reduced power T/O.I decided to go max power 5' flaps.The aircraft was longitudinally unstable after takeoff. It required a lot of fwd then aft trim continuously.Cruise was uneventful.During the practice CAT 111 an extraordinary amount of force and movement was required to keep the HUD presentation within the proper parameters to continue the approach.At 200 feet 'No A111' Illuminated. The approach was continued.The landing was uneventful.I did not know the CG envelope could be extended to accommodate a CG problem however I strongly recommend against this practice if what I experienced is an example of extending the envelope.
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.