# AD 70-24-04: Fuel Shut-Off Valve - Type: Airworthiness directive - Status: Current - Products: Cessna 177, 177A and 177B - Effective: December 8, 1970 - Superseded by: Nothing supersedes this AD - Product type: Aircraft, Small airplane - Amendment: 39-1114 - Registered aircraft: 1,370 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/9FFEDBCE46982A9086256A1C0074A07F.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/70-24-04 ## The airworthiness directive 70-24-04 CESSNA: Amdt. 39-1114. Applies to Cessna 177 Series (Serial Numbers 17700001 thru 17701530) Airplanes. Compliance: Required as indicated, unless already accomplished. To assure that the fuel shutoff valve will return to the full open position after being shut off, accomplish either Paragraph A or B as follows: A) Within 50 hours' time in service after the effective date of this AD and thereafter at intervals not to exceed 100 hours' time in service from the date of the last inspection, accomplish the following: (1) Visually inspect the operation of the fuel shutoff valve by removing the safety wire between the knob and bracket. Then pull the knob out to the full closed position followed by moving the knob forward to the full open position. (2) Check the fuel shutoff valve arm at the firewall to assure that it has returned to the full open position. (3) If the inspection discloses that the fuel shutoff valve is operating normally, reinstall .018 mild steel wire between the knob and bracket. (4) If the inspection discloses that bending of the fuel shutoff valve flexible control wire occurs between the firewall support and the shutoff valve which prevents the fuel shutoff valve from returning to the full open position, prior to further flight make the necessary replacements, adjustments or repairs to assure proper fuel shutoff valve operation, and reinstall .018 mild steel wire between the knob and bracket or alternatively install a heavier fuel shutoff valve control cable P/N S2113-1 and associated parts in accordance with Cessna Service Letter SE70-24, dated September 25, 1970, or later FAA approved revision or any other method approved as an equivalent by the Chief, Engineering and Manufacturing Branch, FAA, Central Region. B) Within 50 hours' time in service after the effective date of this AD, install heavier fuel shutoff valve control cable P/N S2113-1 and associated parts in accordance with Cessna Service Letter SE70-24, dated September 25, 1970, or later FAA approved revision or any other method approved as an equivalent by the Chief, Engineering and Manufacturing Branch, FAA, Central Region. C) When the replacement of the heavier fuel shutoff valve control cable P/N S2113-1 and associated parts described in either Paragraphs A(4) or B of this AD have been accomplished, the inspections required by this AD are no longer required. This amendment becomes effective December 8, 1970. ## Affected data sheets (1) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS A13CE](https://openairdocs.org/tcds/A13CE): Textron Aviation Inc.; names 3 of 3 models: 177, 177A, 177B ## 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: 1,370 (1,370 by airframe model, 0 by engine model) - Makers: Cessna 1,370 Models with the most aircraft: - [Cessna 177B](https://openairdocs.org/model/cessna-177b): 843 aircraft (airframe model) - [Cessna 177](https://openairdocs.org/model/cessna-177): 446 aircraft (airframe model) - [Cessna 177A](https://openairdocs.org/model/cessna-177a): 81 aircraft (airframe model) All 3 models: https://openairdocs.org/ad/70-24-04/models.md Every aircraft: https://openairdocs.org/ad/70-24-04/aircraft.md Its text cites no advisory circulars or STCs. ## NTSB investigations that cite this AD (1) From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. - [NTSB LAX98LA250](https://openairdocs.org/ntsb/LAX98LA250), Jul 29, 1998: Cessna 177 (N177JH), Corona, CA, substantial damage. Probable cause: The loss of engine power due to a partially closed fuel shutoff valve as a result of improper maintenance installation. --- 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.