Airworthiness Directive · Amendment 39-17416 · BRP-Powertrain GmbH & Co KG Rotax Reciprocating Engines
BRP-Powertrain GmbH & Co KG Rotax Reciprocating Engines
Superseded. A later AD replaced this one: AD 2013-15-19. Comply with the one in force.
This AD applies to the following BRP Powertrain GmbH & Co KG Rotax reciprocating engines:
(1) Rotax 912 F2; 912 F3; and 912 F4, from serial number (S/N) 4,413,013 up to S/N 4,413,017 inclusive.
(2) Rotax 912 S2; 912 S3; and 912 S4, from S/N 4,924,468 up to S/N 4,924,491 inclusive.
(3) Rotax 914 F2; 914 F3; and 914 F4, from S/N 4,421,156 up to S/N 4,421,169 inclusive.
We are adopting a new airworthiness directive (AD) for certain BRP-Powertrain GmbH & Co KG Rotax 912 F2; 912 F3; 912 F4; 912 S2; 912 S3; 912 S4; 914 F2; 914 F3; and 914 F4 reciprocating engines. This AD requires a one-time visual inspection for excessive oil deposits or carbon deposits on the No. 2 and No. 3 spark plug center and grounding electrodes, and if found, replacement of the cylinder head before further flight. This AD was prompted by a report of certain No. 2 and No. 3 cylinder heads not manufactured to proper specification. We are issuing this AD to prevent excessive oil consumption, which could result in an in-flight engine shutdown, forced landing, and damage to the airplane.
Unless already done, do the following actions.
(1) Within 5 flight hours or 20 days after the effective date of this AD, whichever occurs first, perform a one-time visual inspection of the center and grounding electrodes of both top and bottom spark plugs on cylinder 2, and cylinder 3, for unusual deposits (excessive carbon or oil). Any excess indicates the cylinder head is not manufactured to proper specification and is leaking oil into the combustion chamber.
(2) Before further flight, replace cylinder heads found to be not manufactured to proper specification.
(3) From the effective date of this AD, do not install any engine listed in the applicability of this AD on an airplane, unless the engine has been inspected and, depending on the findings, affected cylinder heads have been replaced as required by this AD.
For the purpose of this AD, unusual deposits (excessive carbon or oil) is when:
(1) Carbon is a visual buildup of dark carbon deposits on the center and grounding electrodes as well as the immediate surrounding area, and
(2) Excessive oil is a visual buildup indicated by the presence of oil on the center and grounding electrodes as well as the immediate surrounding area, giving a wet appearance.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
