# AD 73-19-10: Elevator Control Horn - Type: Airworthiness directive - Status: Current - Products: Allied Ag Cat Productions G-164A, G-164B, G-164B-15T, G-164B-20T, G-164B-34T and G-164B (with 73 inch wing gap) - Effective: August 29, 1979 - Superseded by: Nothing supersedes this AD - Product type: Aircraft, Small airplane - Amendment: 39-3544 - Registered aircraft: 481 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FD40EC86D23C65C086256E120055A7B1.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/73-19-10 ## The airworthiness directive 73-19-10 GRUMMAN AIRCRAFT: Amendment 39-1719 as amended by Amendments 39-1757 and 39-1828 is further amended by Amendment 39-3544. Applies to G-164A S/N's 1 through 1659A and G-164B S/N's 1B through 56B certificated in all categories and all G-164A and G-164B aircraft in which the elevator control horn assembly and torque tube end fittings have not been modified per Gulfstream American Service Note No. 23 or FAA-approved equivalent. Compliance required as indicated. 1. Within the next 25 hours in service or two weeks, whichever occurs first, unless already accomplished within the last 75 hours in service, inspect the bolts attaching the Elevator Control Horn, P/N A 1841-3, to the left and right side elevator, P/N A1201-5A and A1201-4A respectively, for a standard (ref. AC 43.13-1 Chg. 7) torque rating and for corrosion and thereafter at intervals not to exceed 100 hours in service or 60 days, whichever occurs first. 2. If any looseness is detected, the bolts must be removed and inspected for wear. 3. Replace any worn or corroded bolts with bolts of the same part number or NAS 1304-12 bolts or an equivalent as approved by the Chief, Engineering and Manufacturing Branch, FAA Eastern Region, except that the aircraft may be flown in accordance with FAR 21.197. 4. The bolts referenced in paragraph 3, must be replaced at intervals not exceeding 1000 hours in service or one year, whichever occurs first. 5. Upon submission of substantiating data by an owner or operator through an FAA Maintenance Inspector, the Chief, Engineering and Manufacturing Branch, FAA Eastern Region, may adjust the inspection intervals specified in this AD. 6. The repetitive inspection intervals required by paragraph 1 may be discontinued upon accomplishment of the modification in Grumman Gulfstream Service Note No. 23 dated 8/1/76, or an FAA-approved equivalent. 7. Any equivalent parts or alterations must be approved by the Chief, Engineering and Manufacturing Branch, FAA, Eastern Region. (Grumman American Aviation Corporation AgCat Service Bulletin No. 51 pertains to this subject.) Amendment 39-1719 was effective September 21, 1973. Amendment 39-1757 was effective December 20, 1973. Amendment 39-1828 was effective May 6, 1974. This Amendment 39-3544 is effective August 29, 1979. ## Affected data sheets (1) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS 1A16](https://openairdocs.org/tcds/1A16): Allied Ag Cat Productions Inc.; names 5 of 10 models: G-164B, G-164B-20T, G-164A, G-164B-34T, G-164B-15T ## 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: 481 (481 by airframe model, 0 by engine model) - Makers: Grumman Acft ENG Cor-Schweizer 307, Grumman 65, Schweizer 62, Gulfstream-Schweizer A/C 33, Grumman American Avn. 9, Ag-Cat 5 Models with the most aircraft: - [Grumman Acft ENG Cor-Schweizer G-164B](https://openairdocs.org/model/grumman-acft-eng-cor-schweizer-g-164b): 157 aircraft (airframe model) - [Grumman Acft ENG Cor-Schweizer G-164A](https://openairdocs.org/model/grumman-acft-eng-cor-schweizer-g-164a): 150 aircraft (airframe model) - [Grumman G-164A](https://openairdocs.org/model/grumman-g-164a): 63 aircraft (airframe model) - [Schweizer G-164B](https://openairdocs.org/model/schweizer-g-164b): 56 aircraft (airframe model) - [Gulfstream-Schweizer A/C GULFSTREAM AM G-164B](https://openairdocs.org/model/gulfstream-schweizer-a-c-gulfstream-am-g-164b): 33 aircraft (airframe model) - [Grumman American Avn. G-164B](https://openairdocs.org/model/grumman-american-avn-g-164b): 6 aircraft (airframe model) - [Ag-Cat G-164B](https://openairdocs.org/model/ag-cat-g-164b): 5 aircraft (airframe model) - [Grumman American Avn. G-164A](https://openairdocs.org/model/grumman-american-avn-g-164a): 3 aircraft (airframe model) - [Schweizer G-164B-20T](https://openairdocs.org/model/schweizer-g-164b-20t): 3 aircraft (airframe model) - [Grumman G-164B](https://openairdocs.org/model/grumman-g-164b): 2 aircraft (airframe model) - [Schweizer G164B-34T](https://openairdocs.org/model/schweizer-g164b-34t): 2 aircraft (airframe model) - [Schweizer G164A](https://openairdocs.org/model/schweizer-g164a): 1 aircraft (airframe model) All 13 models: https://openairdocs.org/ad/73-19-10/models.md Every aircraft: https://openairdocs.org/ad/73-19-10/aircraft.md ## Related documents - [AC 43.13-1B CHG 1 Ed Update](https://openairdocs.org/ac/43.13-1): Acceptable Methods, Techniques, and Practices—Aircraft Inspection and Repair. Cited as AC 43.13-1 in the AD's requirements ## 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 FTW76FRA11](https://openairdocs.org/ntsb/FTW76FRA11), Aug 19, 1975: Grumman G-164A (N991X), Bay City, TX, substantial damage --- 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.