# AD 81-01-08: Placard-Operating Speeds - Type: Airworthiness directive - Status: Current - Products: Israel Aircraft Industries 1121, 1121A, 1121B, 1123 and 1124 - Effective: January 16, 1981 - Superseded by: Nothing supersedes this AD - Product type: Aircraft, Large airplane - Amendment: 39-4011 - Registered aircraft: 47 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/C4A4137C3AD59540862569F1006A2297.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/81-01-08 ## The airworthiness directive 81-01-08 ISRAEL AIRCRAFT INDUSTRIES, LIMITED (formerly Aero Commander, North American Rockwell Corporation): Amendment 39-4011. Applies to certain Model 1121, 1121A, 1121B, 1123, and 1124 airplanes, certificated in all categories. Compliance required as indicated. To preclude the possibility of structural failure of the 25 percent wing spar, accomplish the following: (a) Within the next 10 hours time in service after the effective date of this AD, unless already accomplished, or the modification required by paragraph (b) of this AD has been accomplished, install a placard in clear view of the pilots in accordance with the instructions in PART A: PLACARD INSTALLATION, of the appropriate Israel Aircraft Industries, Limited, Service Bulletin, as indicated in the following list: (1) No. CJ-25A, Revision No. 1, dated March 31, 1980, or an FAA-approved equivalent, for Models 1121, 1121A, and 1121B airplanes, serial numbers 94 through 106 and 108 through 150, the placard to read as follows: "MAXIMUM OPERATING SPEED LIMITS (VMO/MMO) - Below 26,000 FT - 315 Kts CAS - Above 26,000 FT - 0.765 M"; (2) No. WW-23A, Revision No. 1, dated March 31, 1980, or an FAA- approved equivalent, for Model 1123 airplanes, serial numbers 107, 151, 153, 155 through 180, and 182 through 186, the placard to read as follows: "MAXIMUM OPERATING SPEED LIMITS (VMO/MMO) - With or without fuel in tip tanks: Below 22,500 FT - 315 Kts CAS Above 22,500 FT - 0.710 M - With autopilot engaged and without fuel in tip tanks: Below 26,000 FT - 315 Kts CAS Above 26,000 FT - 0.765 M"; or (3) No. WW-24-17A, Revision No. 1, dated March 31, 1980, or an FAA- approved equivalent, for Model 1124 airplanes, serial numbers 152, 154, 181, 187 through 260, 262 through 264, and 266 through 269, the placard to read as follows: "MAXIMUM OPERATING SPEED LIMITS (VMO/MMO) - With autopilot disengaged: Below22,500 FT - 315 Kts CAS Above 22,500 FT - 0.710 M - With autopilot engaged: Below 26,000 FT - 315 Kts CAS Above 26,000 FT - 0.765 M". (b) Within the next 600 hours time in service or the next 90 days after the effective date of this AD, whichever occurs first, unless already accomplished, install additional rivets in the 25 percent wing spar between wing stations Xw-33 and Xw-47.5, left and right, in accordance with the instructions in PART B: RIVET INSTALLATION, of the appropriate Israel Aircraft Industries, Limited, Service Bulletin, as indicated in the following list: (1) No. CJ-25A, Revision No. 1, dated March 31, 1980, or an FAA-approved equivalent, for Models 1121, 1121A, and 1121B airplanes, serial numbers 94 through 106 and 108 through 150; (2) No. WW-23A, Revision No. 1, dated March 31, 1980, or an FAA- approved equivalent, for Model 1123 airplanes, serial numbers 107, 151, 153, 155 through 180, and 182 through 186; or (3) No.WW-24A, Revision No. 1, dated March 31, 1980, or an FAA- approved equivalent, for Model 1124 airplanes, serial numbers 152, 154, 181, 187 through 260, 262 through 264, and 266 through 269. (c) The placard required by paragraph (a) may be removed when the modification required by paragraph (b) is completed. (d) If an equivalent means of compliance is used in complying with paragraphs (a) or (b) of this AD, that equivalent must be approved by the Chief, Aircraft Certification Staff, AEU- 100, Europe, Africa, and Middle East Office, FAA, c/o American Embassy, Brussels, Belgium. This amendment becomes effective January 16, 1981. ## Affected data sheets (1) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS A2SW](https://openairdocs.org/tcds/A2SW): Israel Aircraft Industries Ltd.; names 5 of 6 models: 1124, 1121, 1121A, 1123, 1121B ## 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: 47 (47 by airframe model, 0 by engine model) - Makers: Israel Aircraft Industries 45, Aero Commander 2 Models with the most aircraft: - [Israel Aircraft Industries 1124](https://openairdocs.org/model/israel-aircraft-industries-1124): 45 aircraft (airframe model) - [Aero Commander 1121](https://openairdocs.org/model/aero-commander-1121): 1 aircraft (airframe model) - [Aero Commander 1121A](https://openairdocs.org/model/aero-commander-1121a): 1 aircraft (airframe model) All 3 models: https://openairdocs.org/ad/81-01-08/models.md Every aircraft: https://openairdocs.org/ad/81-01-08/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.