Airworthiness Directive · Amendment 39-13939 · Bombardier-Rotax GmbH Type 912 F, 912 S, and 914 F Series Reciprocating Engines
Bombardier-Rotax GmbH Type 912 F, 912 S, and 914 F Series Reciprocating Engines
This AD applies to Bombardier-Rotax GmbH 912 F, 912 S, and 914 F series reciprocating engines. These engines are installed on, but not limited to, Diamond Aircraft Industries, DA20-A1, Diamond Aircraft Industries GmbH Model HK 36 TTS, Model HK 36TTC, and Model HK 36 TTC-ECO, Iniziative Industriali Italiane S.p.A. Sky Arrow 650 TC and Sky Arrow 650 TCN, Aeromot-Industria Mecanico Metalurgica ltda., Models AMT-300 and AMT-200S, and Stemme S10-VT aircraft.
The FAA is superseding an existing airworthiness directive (AD) for Bombardier-Rotax GmbH Type 912 F, 912 S, and 914 F series reciprocating engines. That AD currently requires venting of the lubrication system and inspection of the valve train on all engines. That AD also requires venting of the lubrication system of all engines on which the lubrication system has been opened, and any engine on which the propeller has been rotated one full turn in the wrong direction. This AD requires similar actions, and also requires removing the existing part number oil dipstick from service and installing a new oil dipstick. This AD results from the need to clarify the mandated procedures for inspections and venting. This AD also results from the manufacturer discovering that under certain circumstances, the oil level in the oil tank can fall below the minimum level required to sustain proper engine lubrication. We are issuing this AD to prevent damage to the engine valve train due to inadequate venting of the lubrication system, which can result in an in-flight engine failure and forced landing.
You are responsible for having the actions required by this AD performed within the compliance times specified unless the actions have already been done.
Before the next engine start, for all Bombardier-Rotax GmbH 912 F, 912 S, and 914 F series reciprocating engines that have not been operated since doing any of the actions identified in section 1.5(a) of Rotax Mandatory Service Bulletin (MSB) SB-912-036/SB-914-022, Revision 1, dated August 2002, do the following:
(1) Perform venting of the lubrication system; and
(2) Perform inspection for correct venting of the hydraulic valve tappets. Use Section 3.1.1 through section 3.1.4 of the Accomplishment Instructions of Rotax MSB SB-912-036/SB-914-022, Revision 1, dated August 2002 to do the venting and inspection.
Before the next engine start, for all Bombardier-Rotax GmbH 912 F, 912 S, and 914 F series reciprocating engines that have been operated for 50 hours or less on the effective date of this AD since doing any of the actions identified in section 1.5 (b) of Rotax MSB SB-912-036/SB-914-022, Revision 1, dated August 2002, do the following:
(1) Disassemble and perform inspection of the engine valve train; and
(2) Reassemble, vent the lubrication system, and inspect for correct venting of the hydraulic valve tappets. Use Section 3.1.5 through Section 3.1.7 of the Accomplishment Instructions of Rotax MSB SB-912-036/SB-914-022, Revision 1, dated August 2002.
Thereafter, for all Bombardier-Rotax GmbH 912 F, 912 S, and 914 F series reciprocating engines, after doing any of the actions in the following paragraphs (h)(1) through (h)(4), vent the lubrication system and inspect for correct venting of the hydraulic valve tappets before starting the engine. Use section 3.1.1 through section 3.1.4 of the Accomplishment Instructions of Rotax MSB SB-912-036/SB-914-022, Revision 1, dated August 2002 to do the venting and inspecting.
(1) The installation of a new or overhauled engine.
(2) The oil system has been opened allowing air to enter the valve train (e.g. oil pump, oil cooler, oil suction line removed which allows oil to drain from the engine oil galleries).
(3) The engine oil was changed using procedures other than those included in section 1.2 of Rotax MSB SB-912-036/SB-914-022 Revision 1, dated August 2002.
(4) The propeller was turned more than one turn in the wrong direction of rotation.
(i) At the next oil change or within 100 hours time-in-service after the effective date of this AD, whichever is later, remove the oil dipstick, part number (P/N) 956150, from service, and install a dipstick that has a different P/N. Information on removing oil dipstick P/N 956150 from service can be found in Rotax MSB SB-912-040/SB-914-026, Revision 1, dated August 2003.
After the effective date of this AD, do not use dipstick P/N 956150 after complying with paragraph (i) of this AD.
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.
