# AD 80-21-06: Muffler Core and Body Assembly - Type: Airworthiness directive - Status: Current - Products: American Champion 7ECA, 7GC, 7GCA, 7GCAA, 7GCB, 7GCBA, 7GCBC, 7HC, 7KC, 7KCAB and 8KCAB - Effective: October 16, 1980 - Superseded by: Nothing supersedes this AD - Product type: Aircraft, Small airplane - Amendment: 39-3939 - Registered aircraft: 3,348 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/271900F2BD6A7AE7862569AF00767614.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/80-21-06 ## The airworthiness directive 80-21-06 BELLANCA (CHAMPION): Amendment 39-3939. Applies to Bellanca (Champion) Models 7GC, 7GCB, 7HC, 7KC, 7GCA, 7GCBA, 7ECA (Serial Numbers prior to 985-74), 7GCAA (Serial Numbers prior to 280-74), 7GCBC (Serial Numbers prior to 604-74), 7KCAB (Serial Numbers prior to 405-74), and 8KCAB (Serial Numbers prior to 120-74). Compliance is required within the next 25 hours time in service, or 60 days after the effective date of this AD, whichever occurs first, and thereafter at intervals not to exceed 100 hours time in service, or 12 months from the last inspection, whichever occurs first. To prevent a degradation of the induction system icing protection or partial engine power loss, accomplish the following: (1) Visually inspect the baffle installation within the muffler core and body assemblies, Bellanca (Champion) P/Ns 3-1079 or 3-1493, for cracking or deterioration, with the mufflers removed from the aircraft. Replace any muffler where baffle cracking or deteriorationis evident, with an airworthy muffler core and body assembly of the same or other FAA approved part number. (2) If an airplane is at an unsuitable base when compliance with this AD is required, the airplane may be issued a special flight permit in accordance with FAR 21.197 and 21.199 for the purpose of flying to a base where the required inspection may be performed. (3) Equivalent methods of complying with this AD, including the installation of different exhaust systems, must be approved by the Chief, Engineering and Manufacturing Branch, FAA, Great Lakes Region. This amendment becomes effective October 16, 1980. ## Affected data sheets (2) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS A-759](https://openairdocs.org/tcds/A-759): American Champion Aircraft Corp.; names 10 of 22 models: 7KC, 7GCBA, 7GCA, 7KCAB, 7GC, 7GCAA, 7HC, 7GCBC… - [TCDS A21CE](https://openairdocs.org/tcds/A21CE): American Champion Aircraft Corp.; names 1 of 2 models: 8KCAB ## 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: 3,348 (3,348 by airframe model, 0 by engine model) - Makers: Bellanca 1,553, Champion 953, American Champion 838, Aeronca 4 Models with the most aircraft: - [Bellanca 7GCBC](https://openairdocs.org/model/bellanca-7gcbc): 487 aircraft (airframe model) - [American Champion 8KCAB](https://openairdocs.org/model/american-champion-8kcab): 449 aircraft (airframe model) - [Champion 7ECA](https://openairdocs.org/model/champion-7eca): 419 aircraft (airframe model) - [Bellanca 8KCAB](https://openairdocs.org/model/bellanca-8kcab): 371 aircraft (airframe model) - [Bellanca 7ECA](https://openairdocs.org/model/bellanca-7eca): 347 aircraft (airframe model) - [American Champion 7GCBC](https://openairdocs.org/model/american-champion-7gcbc): 232 aircraft (airframe model) - [Bellanca 7KCAB](https://openairdocs.org/model/bellanca-7kcab): 230 aircraft (airframe model) - [Champion 7KCAB](https://openairdocs.org/model/champion-7kcab): 151 aircraft (airframe model) - [Champion 7GCBC](https://openairdocs.org/model/champion-7gcbc): 144 aircraft (airframe model) - [American Champion 7GCAA](https://openairdocs.org/model/american-champion-7gcaa): 119 aircraft (airframe model) - [Bellanca 7GCAA](https://openairdocs.org/model/bellanca-7gcaa): 118 aircraft (airframe model) - [Champion 7GCAA](https://openairdocs.org/model/champion-7gcaa): 114 aircraft (airframe model) - [Champion 7GCB](https://openairdocs.org/model/champion-7gcb): 55 aircraft (airframe model) - [American Champion 7ECA](https://openairdocs.org/model/american-champion-7eca): 38 aircraft (airframe model) - [Champion 7GC](https://openairdocs.org/model/champion-7gc): 37 aircraft (airframe model) - [Champion 7HC](https://openairdocs.org/model/champion-7hc): 8 aircraft (airframe model) - [Champion AERONCA 7GC](https://openairdocs.org/model/champion-aeronca-7gc): 7 aircraft (airframe model) - [Champion 8KCAB](https://openairdocs.org/model/champion-8kcab): 5 aircraft (airframe model) - [Champion AERONCA 7GCB](https://openairdocs.org/model/champion-aeronca-7gcb): 3 aircraft (airframe model) - [Champion AERONCA 7HC](https://openairdocs.org/model/champion-aeronca-7hc): 3 aircraft (airframe model) All 28 models: https://openairdocs.org/ad/80-21-06/models.md Every aircraft: https://openairdocs.org/ad/80-21-06/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.