I have this paper work in my logs and it actually is not an STC. Mine is a letter on FAA Great Lakes Region letter head and signed by FAA Inspector John O'Rourke, AGL-GADO-5, Cincinati, OH. It is dated 3/27/74 and is specific to my registration number.
The title of the letter is AIRCRAFT OPERATING LIMITATIONS WITH DOOR REMOVED. The text of the letter is paraphrased below:
This aircraft may be flown with not more than one cabin door, removed for the purpose of aerial photography and parachute jumping, provided the aircraft is operated in accordance with the applicable Federal Aviation Regulations and the following limitations:
1. Max speed not to exceed any of the following: the approved maneuvering speed, 70% of max level flight speed, or 70% of max structural cruising speed.
2. No acrobatic maneuvers.
3. Maximum yaw angle 10 degrees, Max bank angle 15 degrees.
4. FAA approved safety belts must be worn by each occupant.
5. all occupants must wear chutes when conducting intentional parachute jumping ops.
6. No smoking.
7. If not parachute jumping, "a suitable guardrail or equivalent safety device must be provided for the doorway."
8. Tie down or stow all loose articles.
9. No baggage.
10. Static lines must be free of controls/control surfaces.
11.VFR only.
12. Remove door clips from underside of wing prior to parachute jumping.
13. Pilot must have a private certificate to fly jumpers.
14. Student pilot can't fly solo with door removed.
15. Can't operate aircraft for purposes other than for which it is certified with door removed.
16. Placard must be installed
17. Copy of these limitations must be carried when the door is off.
18. These operating limits are part of the airworthiness certificate.
Plus to be strictly legal, I would guess a logbook entry and adjusted W & B would be required also. Really just need for the insurance adjuster after the fact...
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