AD 90-03-19 R1
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | M7 Aerospace LLC | SA226-AT | Airworthiness Directives; FAIRCHILD AIRCRAFT CORPORATION (formerly Swearingen Aviation Corporation) Models SA226-T, SA226-T(B), SA226-AT, SA226-TC, SA227-TT, SA227-AT, SA227-AC Airplanes |
| aircraft | M7 Aerospace LLC | SA226-T | Airworthiness Directives; FAIRCHILD AIRCRAFT CORPORATION (formerly Swearingen Aviation Corporation) Models SA226-T, SA226-T(B), SA226-AT, SA226-TC, SA227-TT, SA227-AT, SA227-AC Airplanes |
| aircraft | M7 Aerospace LLC | SA226-TC | Airworthiness Directives; FAIRCHILD AIRCRAFT CORPORATION (formerly Swearingen Aviation Corporation) Models SA226-T, SA226-T(B), SA226-AT, SA226-TC, SA227-TT, SA227-AT, SA227-AC Airplanes |
| aircraft | M7 Aerospace LLC | SA226-T(B) | Airworthiness Directives; FAIRCHILD AIRCRAFT CORPORATION (formerly Swearingen Aviation Corporation) Models SA226-T, SA226-T(B), SA226-AT, SA226-TC, SA227-TT, SA227-AT, SA227-AC Airplanes |
| aircraft | M7 Aerospace LLC | SA227-AC (C-26A) | Airworthiness Directives; FAIRCHILD AIRCRAFT CORPORATION (formerly Swearingen Aviation Corporation) Models SA226-T, SA226-T(B), SA226-AT, SA226-TC, SA227-TT, SA227-AT, SA227-AC Airplanes |
| aircraft | M7 Aerospace LLC | SA227-AT | Airworthiness Directives; FAIRCHILD AIRCRAFT CORPORATION (formerly Swearingen Aviation Corporation) Models SA226-T, SA226-T(B), SA226-AT, SA226-TC, SA227-TT, SA227-AT, SA227-AC Airplanes |
| aircraft | M7 Aerospace LLC | SA227-TT | Airworthiness Directives; FAIRCHILD AIRCRAFT CORPORATION (formerly Swearingen Aviation Corporation) Models SA226-T, SA226-T(B), SA226-AT, SA226-TC, SA227-TT, SA227-AT, SA227-AC Airplanes |
Unsafe Condition
An inadvertent deenergized battery bus relay, which could result in unrecoverable loss of the airplane's electrical power.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Modify the electrical system using procedures from Fairchild Service Bulletins SA226-24-032 and SA227-24-013, including removing the access cover of the J-Box (EP11), locating Battery Bus Relay K40, removing the diode from across X1 and X2 terminals, reinstalling the access cover, and verifying battery voltage on the LH Essential, RH Essential, and Nonessential busses.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within the next 100 hours time-in-service after the effective date of this AD
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Models SA226-T (S/N T201-T275, T277-T291), SA226-T(B) (S/N T(B)276 and T(B)292-T(B)417), SA226-AT (S/N AT001-AT074), SA226-TC (S/N TC201-TC419), SA227-TT (S/N TT421-TT541), SA227-AT (S/N AT423-AT695), SA227-AC (S/N AC406, AC415, AC416, AC420-AC705, AC707-AC733)
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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