Dash 8-100
Flight Crew Air Transport Pilot (ATP)
Deviation / Discrepancy - Procedural FAR; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural Weight And Balance
Company Policy; Procedure; Manuals
Takeoff out of ZZZ was completed using the company provided ATOG for departure off runway 31 with tailwind calculations completed and at an approved weight. After departure I felt there may have been a compatibility issue and during cruise I looked in the AFM and discovered supplement 3 is not compatible with supplement 26. Which means operations in tailwinds between 10-20kts cannot be conducted on gravel runways. There is absolutely no reason there should be ATOGS provided to crewmembers for tailwind operations from a gravel runway when this is not valid. This is a trap the company has overlooked apparently and the tailwind notes for 10-20 should be removed from the ATOGS completely and immediately to prevent other crews from this circumstance.
[Report narrative contained no additional information.]
DHC-8-100 flight crew discovered incompatibility with ATOG procedures off gravel surfaced runways.