George,
If I change my 53 control wheels to later model Cessna ram's horn type control wheels, does it require; a log book entry, a 337, or field approval? Thanks for the information.
Harold H
N92CP
Mbr# 893
Ram's Horn Control Wheel again for George
Moderators: GAHorn, Karl Towle, Bruce Fenstermacher
-
Harold Holiman
- Posts: 579
- Joined: Tue Apr 23, 2002 1:54 pm
If a specific part number is approved by the manufacturer as a replacement part for your airplane, unless it is part of a major modification or repair, then only a logbook entry is required (by the appropriately rated person.)
If the part is not manufacturer-approved for the aircraft, then some other approval basis must exist in order to properly install it. These other approvals could be either 1) STC, which is a supplement to the aircraft type certificate and since that is a major alteration of the airplane a Form 337 must be filled out and submitted, or 2) a "field approval" for the alteration (Form 337 with Block 3 signed off by the FAA. Think of this as an STC for only one airplane at a time (yours), for a part (or modification) not previously approved for your aircraft.
The other times a Form 337 is apprpriate is when an aircraft is repaired in any way other than minor. (A minor repair would be replacing a bolt or part that is approved. A major repair would be replacing an entire wing skin, or fuselage panel, or repairing a hole in the skin larger than 6 inches or that makes a new seam, or any structural component, etc.. See FAR 43, Appendix A for a list of Major repairs.)
Therefore, unless the replacement of your control wheels occurs with an approved part number for your aircraft, you must 1) Submit a Form 337 and 2) gain FAA field-approval on that Form in Block 3. Whenever you plan to request a field approval, it's always best to first contact your FSDO inspector and discuss the modification BEFORE doin it. This will not only avoid a lot of trouble and perhaps wasted money, but just imagine how you'd feel if your neighbor decided to come alter your landscaping (something under your jurisdiction, not his) and then asked you if it was ok.
If the part is not manufacturer-approved for the aircraft, then some other approval basis must exist in order to properly install it. These other approvals could be either 1) STC, which is a supplement to the aircraft type certificate and since that is a major alteration of the airplane a Form 337 must be filled out and submitted, or 2) a "field approval" for the alteration (Form 337 with Block 3 signed off by the FAA. Think of this as an STC for only one airplane at a time (yours), for a part (or modification) not previously approved for your aircraft.
The other times a Form 337 is apprpriate is when an aircraft is repaired in any way other than minor. (A minor repair would be replacing a bolt or part that is approved. A major repair would be replacing an entire wing skin, or fuselage panel, or repairing a hole in the skin larger than 6 inches or that makes a new seam, or any structural component, etc.. See FAR 43, Appendix A for a list of Major repairs.)
Therefore, unless the replacement of your control wheels occurs with an approved part number for your aircraft, you must 1) Submit a Form 337 and 2) gain FAA field-approval on that Form in Block 3. Whenever you plan to request a field approval, it's always best to first contact your FSDO inspector and discuss the modification BEFORE doin it. This will not only avoid a lot of trouble and perhaps wasted money, but just imagine how you'd feel if your neighbor decided to come alter your landscaping (something under your jurisdiction, not his) and then asked you if it was ok.