# AD 76-11-02: Engine Cowl Locks - Type: Airworthiness directive - Status: Current - Products: SOCATA MS 880B, MS 892A-150, MS 892E-150, MS 893A, MS 893E, MS 894A and MS 894E - Effective: June 7, 1976 - Superseded by: Nothing supersedes this AD - Product type: Aircraft, Small airplane - Amendment: 39-2619 - Registered aircraft: 36 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/28CFC43893BB12AA86256A56005C5422.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/76-11-02 ## The airworthiness directive 76-11-02 MORANE SAULNIER (SOCATA): Amendment 39-2619. Applies to Model MS880B, MS892A-150 and E-150, MS893A and E, and MS894A and E airplanes, serial numbers 831 and above, certificated in all categories. Compliance is required as indicated, unless already accomplished. To prevent the possible loss of an engine cowling due to improper latching of locks and cowl lock wear, accomplish the following: (a) For airplanes incorporating Socata-type engine cowl locks, within the next 10 hours time in service after the effective date of this AD, either incorporate the following cowl locking procedures in the Airplane Flight Manual immediately following Section 4.3.1, Step 3; or if an Airplane Flight Manual is not available, install a placard adjacent to one of the engine cowl locks which contains the following cowl locking procedures: Cowl Locking Procedures. (1) Raise latch locking lever to maximum travel to allow cowl upper catch to engage lower cowl catch. (2) Press latch locking lever to full down position until distinct snap is heard indicating completed locking. (3) Check the locking mechanism by pulling the lock latching lever with a force sufficient to overcome the weight of the lever and low friction forces. (b) For airplanes incorporating Socata-type engine cowl locks, within the next 25 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 last inspection - (1) Visually inspect the engine lower cowling metal centering tabs and the upper cowling centering pins, for wear of the metal tab receiving holes and wear of the centering pins to assure proper mating of the upper and lower cowling. Replace the metal centering tabs and cowling centering pins, found to be worn; and (2) Inspect the engine cowling locking mechanism and if deterioration in locking push force is evident as demonstrated by a lack of snap action on the latch locking lever, adjustthe Socata type engine cowl lock by removing the cotter pin in the upper catch, threading the latch trunnion into the upper catch a distance of one or more turns, and reinserting the cotter pin in accordance with the procedure described in paragraphs 1.2 and 3.1 of Socata Service Bulletin No. 107 Gr. 71-06, dated November 1972, or an FAA-approved equivalent. (c) For MS880B airplanes, serial numbers 831 through 1604, equipped with Dialatch engine cowl locks - (1) Within the next 50 hours time in service after the effective date of this AD, accomplish the following in accordance with Socata Service Bulletin No. 77/2, Gr. 71-03, dated May 1973, or an FAA-approved equivalent: (i) Replace the Dialatch cowl locks with Socata-type engine cowl locks. (ii) Install reinforcing angle plates on the engine cowl centering pin brackets. (iii) Install engine cowl stops; (2) Within the next 50 hours time in service after the effective date of this AD, revise the Airplane FlightManual, or install a placard, as specified in paragraph (a) of this AD; and (3) Within the next 100 hours time in service after installation of the Socata type engine cowl lock in accordance with paragraph (c)(1)(i) of this AD and thereafter at intervals not to exceed 100 hours time in service from the last inspection, visually inspect the engine lower cowling metal centering tabs and the upper cowling centering pins, for wear of the metal tab receiving holes and wear of the centering pins to assure proper mating of the upper and lower cowling. Replace the metal centering tabs and cowling centering pins found to be worn. This amendment becomes effective on June 7, 1976. ## Affected data sheets (1) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS 7A14](https://openairdocs.org/tcds/7A14): Daher; names 7 of 13 models: MS 892A-150, MS 894E, MS 894A, MS 880B, MS 892E-150, MS 893E, MS 893A ## 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: 36 (36 by airframe model, 0 by engine model) - Makers: S.O.C.A.T.A. 30, Morane Saulnier 3, Morane-Saulnier 3 Models with the most aircraft: - [S.O.C.A.T.A. MS894A](https://openairdocs.org/model/s-o-c-a-t-a-ms894a): 27 aircraft (airframe model) - [Morane-Saulnier MS880B](https://openairdocs.org/model/morane-saulnier-ms880b): 3 aircraft (airframe model) - [Morane Saulnier MS893A](https://openairdocs.org/model/morane-saulnier-ms893a): 2 aircraft (airframe model) - [S.O.C.A.T.A. MS893E](https://openairdocs.org/model/s-o-c-a-t-a-ms893e): 2 aircraft (airframe model) - [Morane Saulnier MS893E](https://openairdocs.org/model/morane-saulnier-ms893e): 1 aircraft (airframe model) - [S.O.C.A.T.A. MS880B](https://openairdocs.org/model/s-o-c-a-t-a-ms880b): 1 aircraft (airframe model) All 6 models: https://openairdocs.org/ad/76-11-02/models.md Every aircraft: https://openairdocs.org/ad/76-11-02/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 ERA21LA155](https://openairdocs.org/ntsb/ERA21LA155), Mar 15, 2021: Socata MS894A (N42BF), Monroe, GA, substantial damage. Probable cause: Maintenance personnel’s failure to properly inspect and maintain the airplane’s engine cowling latches, which resulted in the in-flight separation of the engine cowling and a subsequent forced… --- 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.