# AD 75-11-06: Check Valve - Type: Airworthiness directive - Status: Current - Products: Alexandria 17-31, 17-31A, 17-31ATC and 17-31TC - Effective: June 25, 1975 - Superseded by: Nothing supersedes this AD - Product type: Aircraft, Small airplane - Amendment: 39-2242 - Registered aircraft: 147 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/26FEE01ED8DB032486256E0D00503949.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/75-11-06 ## The airworthiness directive 75-11-06 BELLANCA: Amendment 39-2209 as amended by Amendment 39-2242. Applies to the following airplanes: 17-31 : S/N 32-1 17-31TC : All serials 17-31A : S/N 32-21 through 75-32-159 except S/N 32-25 17-31ATC : S/N 31004 through S/N 75-31116 Compliance: Required within the next 25 hours time in service after the effective date of this AD. The airplane may be flown to a facility where the modification can be accomplished after the expiration of the 25 hours time in service after the effective date of the AD. To prevent possible engine power failure accomplish the following as appropriate: A. Models Up To But Not Including 1973 Models* The check valve (P/N 19121-206**) is located on the diagonal on the forward wing truss under R/H front seat; the following procedure is to be used. 1. Remove right front seat, lift up carpet and remove plywood cover. 2. Remove check valve. 3. Disassemble the check valve, remove the internal check ball and reassemble the valve without the internal check ball. Remove the Bellanca placard showing the valve as P/N 19121-206 and remark the valve housing with a yellow stripe through the AN part number. 4. Reinstall the valve in the vapor return line. 5. Make appropriate log book entries. B. 1973 Model Aircraft* The check valve (19121-206**) is located under right floorboard; the following procedure is to be used: 1. Remove: right front seat forward stop and seat, floor mat, right kick panel, right half of heel plate, metal cover over fuel selector, and right floorboard. 2. Remove check valve. 3. Disassemble the check valve, remove the internal check ball and reassemble the valve without the internal check ball. Remove the Bellanca placard showing the valve as P/N 19121-206 and remark the valve housing with a yellow stripe through the AN part number. 4. Reinstall the valve in the vapor return line. 5. Reverse Step 1 to complete operation.6. Make appropriate log book entries. C. 1974 and 1975 Model Aircraft* The check valve (19121-206**) is located under right floorboard; the following procedure is to be used: 1. Remove: right front seat forward stop and seat, floor mat, right cabin heat fresh air deflector, seat adjuster mechanism, metal cover over fuel selector, and right floorboard. 2. Remove check valve. 3. Disassemble the check valve, remove the internal check ball and reassemble the valve without the internal check ball. Remove the Bellanca placard showing the valve as P/N 19121-206 and remark the valve housing with a yellow stripe through the AN part number. 4. Reinstall the valve in the vapor return line. 5. Reverse Step 1 to complete procedure. 6. Make appropriate log book entries. *Identify aircraft model year by referring to first two digits in serial number for 1973, 1974 and 1975 aircraft; aircraft serial numbers prior to 1973 were not coded to year.**The check valve is a small 13/16 inch diameter by 1 3/4 inch long (plus fitting) AN valve located in the vapor return line between the fuel selector and the firewall. The valve may be positively identified by noting the Bellanca placard rework number 19121-206 located after AN in lieu of the AN number. Amendment 39-2209 became effective May 22, 1975. This amendment 39-2242 becomes effective June 25, 1975. ## Affected data sheets (2) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS 1A3](https://openairdocs.org/tcds/1A3): Bellanca Aircraft Inc.; names 2 of 7 models: 17-31TC, 17-31 - [TCDS A18CE](https://openairdocs.org/tcds/A18CE): Bellanca Aircraft Inc.; names 2 of 3 models: 17-31ATC, 17-31A ## Registered aircraft it may apply to (OpenAirDocs) Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment. - Aircraft: 147 (147 by airframe model, 0 by engine model) - Makers: Bellanca 147 Models with the most aircraft: - [Bellanca 17-31ATC](https://openairdocs.org/model/bellanca-17-31atc): 71 aircraft (airframe model) - [Bellanca 17-31A](https://openairdocs.org/model/bellanca-17-31a): 71 aircraft (airframe model) - [Bellanca 17-31](https://openairdocs.org/model/bellanca-17-31): 5 aircraft (airframe model) All 4 models: https://openairdocs.org/ad/75-11-06/models.md Every aircraft: https://openairdocs.org/ad/75-11-06/aircraft.md Its text cites no advisory circulars or STCs. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.