Its nearing dusk as two Piper Senecas descend toward Highfuelprices Regional Airport on vectors for the VOR approach. Published minimums are 500 and 1. The airport has weather reporting and forecasting, the airplanes have the same avionics. Seneca A is being flown by a pilot with commercial, instrument and multi-engine ratings and a current Part 135 approval; the flight is being operated under Part 135 as there is a five-pound box of urgent documents under the cargo net 288
Flying Below Minimum Altitudes
Its nearing dusk as two Piper Senecas descend toward Highfuelprices Regional Airport on vectors for the VOR approach. Published minimums are 500 and 1. The airport has weather reporting and forecasting, the airplanes have the same avionics. Seneca A is being flown by a pilot with commercial, instrument and multi-engine ratings and a current Part 135 approval; the flight is being operated under Part 135 as there is a five-pound box of urgent documents under the cargo net behind the rear seats. Meanwhile, Seneca B is being flown by a pilot with commercial, instrument and multi-engine ratings, a 23-month-old flight review and some question as to whether he is instrument-current. It is a Part 91 flight. There are four passengers on board who are splitting the cost of the flight with the pilot. Before they reach the final approach fix, the controller advises both aircraft that the airport weather is now 400 overcast and mile visibility in rain and mist. Seneca A pilot advises the controller she cannot continue the approach and that shed like to climb 1000 feet or so and hold at the FAF while she decides whether to go to her alternate or wait for the weather to improve. The pilot of Seneca B hears the weather report and continues with the approach because he wants to take a look.
Key Takeaways:
- Part 91 pilots have greater legal latitude to initiate instrument approaches in weather conditions below minimums ("take a look") compared to Part 135 pilots, who are prohibited from doing so, leading to a disparity in safety levels.
- This "taking a look" authority often leads to accidents due to powerful psychological forces like "plan continuation bias" (goal-directed behavior near destination) and "partial reinforcement" (occasional success encouraging riskier behavior), which compel pilots to descend below safe minimums.
- The article recommends that Part 91 pilots recognize these inherent psychological biases and refuse to begin approaches when weather is below minimums, even if legally permissible, to prevent making unsafe and ultimately fatal decisions.
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