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B767 air carrier pilot reported a discrepancy between the takeoff power settings on the flight plan vs those actually displayed on the tmsp.
| Attributes | |
| ACN | 1646207 |
| Time | |
| Date | 201905 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | B767-300 and 300 ER |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Takeoff |
| Route In Use | None |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Engine Indications |
| Person 1 | |
| Function | Pilot Not Flying |
| Qualification | Flight Crew Commercial Flight Crew Instrument Flight Crew Multiengine Flight Crew Private |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy Deviation - Procedural Weight And Balance |
Narrative:
Aero data discrepancy between to 2 assumed temp N1 on fdp and thrust setting on tmsp; fdp was@4.5% higher on fdp than tmsp. [This] has been happening repeatedly. Elected to perform to 2 and numbers matched. Concern is that V speeds are based on a very different thrust setting than what airplane calculates. Many other crews are noticing the same issue. Began late last week for me. So far; I've only flown 767s; haven't checked if 757s are having same issue.
Original NASA ASRS Text
Title: B767 air carrier pilot reported a discrepancy between the takeoff power settings on the flight plan vs those actually displayed on the TMSP.
Narrative: Aero data discrepancy between TO 2 assumed temp N1 on FDP and thrust setting on TMSP; FDP was@4.5% higher on FDP than TMSP. [This] has been happening repeatedly. Elected to perform TO 2 and numbers matched. Concern is that V speeds are based on a very different thrust setting than what airplane calculates. Many other crews are noticing the same issue. Began late last week for me. So far; I've only flown 767s; haven't checked if 757s are having same issue.
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.