HomeAD libraryAD 51-23-04Airworthiness Directive · Sikorsky Aircraft Corporation HelicoptersAD 51-23-04Sikorsky Aircraft Corporation HelicoptersRotorcraftIssued1951EffectiveNot statedMakerSikorsky Aircraft CorporationSupersedesNothingApplies toThis AD applies to Sikorsky Aircraft Corporation S-51.The models as the FAA's AD index lists them. The serial ranges, installed parts and exceptions are in the AD itself: read it at the FAA.Official sourcesThe AD at the FAA · its text as the FAA keeps itFAA Dynamic Regulatory System (DRS) · search 51-23-04 for its current status and any corrections
