Narrative:

On approach into txkf during our arrival briefing we discovered we did not have enough fuel to fly to an alternate airport. Normally we use ack as an alternate when a decision to divert more than 50 miles from txkf is required. In our briefing we discussed alternate plans if the txkf runway were to become unusable for landing. After landing we debriefed to find out our factors in missing our fuel requirements. Fatigue is insidious and caught us. We just blocked 19 hours of flying in 3 calendar days with 4 days of early show times. We should have stopped in tist but we had no tools or charts to rely on as to our mental alertness. Our solution once in txkf was to request a fatigue call to reset our mental alertness. Additionally we called dispatch to confirm we should have automatically been planned an alternate and additional fuel should have been added to our flight.[I recommend] fatigue mitigation software to prevent pilots [from] being assigned 19 hours of flight time in a 72 hour period and a dispatch system that automatically assigns an alternate on flights to txkf.

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Original NASA ASRS Text

Title: Medium Transport pilot reported that if the weather had deteriorated; there was not sufficient fuel to fly to the planned alternate airport.

Narrative: On approach into TXKF during our arrival briefing we discovered we did not have enough fuel to fly to an alternate airport. Normally we use ACK as an alternate when a decision to divert more than 50 miles from TXKF is required. In our briefing we discussed alternate plans if the TXKF runway were to become unusable for landing. After landing we debriefed to find out our factors in missing our fuel requirements. Fatigue is insidious and caught us. We just blocked 19 hours of flying in 3 calendar days with 4 days of early show times. We should have stopped in TIST but we had no tools or charts to rely on as to our mental alertness. Our solution once in TXKF was to request a fatigue call to reset our mental alertness. Additionally we called dispatch to confirm we should have automatically been planned an alternate and additional fuel should have been added to our flight.[I recommend] fatigue mitigation software to prevent pilots [from] being assigned 19 hours of flight time in a 72 hour period and a dispatch system that automatically assigns an alternate on flights to TXKF.

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.