121.547 Admission to flight deck.
(too much to post now, you may want to read it sometime)
121.548 Aviation safety inspector's credentials: Admission to pilot's compartment.
Whenever, in performing the duties of conducting an inspection, an inspector of the Federal Aviation Administration presents form FAA 110A, "Aviation Safety Inspector's Credential," to the pilot in command of an aircraft operated by a certificate holder, the inspector must be given free and uninterrupted access to the pilot's compartment of that aircraft.
121.581 Observer's seat: En route inspections.
(a) Except as provided in paragraph (c) of thìs section, each certificate holder shall make available a seat on the flight deck of each airplane, used by it in air commerce, for occupancy by the Administrator while conducting en route inspections. The location and equipment of the seat, with respect to its suitability for use in conducting en route inspections, is determined by the Administrator.
(b) In each airplane that has more than one observer's seat, in addition to the seats required for the crew complement for which the airplane was certificated, the forward observer's seat or the observer's seat selected by the Administrator must be made available when complying with paragraph (a) of this section.
(c) For any airplane type certificated before December 20, 1995, for not more than 30 passengers that does not have an observer seat on the flightdeck, the certificate holder must provide a forward passenger seat with headset or speaker for occupancy by the Administrator while conducting en route inspections.
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All Enroute Inspections are approved by a FAA supervisor. They track this very carefully and the GAO has oversight and audits the records. We do travel to the same location time and time again. We need to explain why we have to travel to certain locations to the GAO.
Jump seating is a pain in the (lower) back. I do not know any one who has to jumpseat time and time again use it for fun.
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Before you get too hostle, think about this: Part 25 requires a forward observers seat for enroute inspection to be built into the aircraft. Do you really think the airlines/manufactures would spend the money/time to build a seat if they did not have to? Check airman can and still give route checks from the front seats.
It is an old reg and pilots have used the seat for years to go from work to home. When an Inspector is not using the seat the regs and company policy say who can use it. The observer is a third (or forth) set of eyes and ears in the cockpit. Use the asset.
You may not like this, but that is how it is..........
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25.785 Seats, berths, safety belts, and harnesses.
(k) (1) Each forward observer's seat required by the operating rules must be shown to be suitable for use in conducting the necessary enroute inspection.
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If you wish to flame away it will not change the FAR. I probably have heard the complaint before and there is not much I can do about it.