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AIRCRAFT ENGINES SERVICE BULLETIN
CHECKING OF THE CRANKCASE ON ROTAX ENGINE TYPE 912 AND 914
(SERIES) SB-912-029 SB-914-018 MANDATORY
Engines affected All versions
of the engine type:
- 912 A up to S/N4,410.384
- 912 F up to S/N4,412.796
- 914 F up to S/N4,420.313 1.2)
Reason:
One or more of the following could result in formation of cracks
on the crankcase:
- Unapproved and untested modifications
- lmproper carburetor synchronization - Unsuitable idle speed (too
low)
- Unsuitable engine suspension I non-neutralized vibrations
- Propeller balance out of tolerance
- Friction torque in the backlash range of gearbox not within
tolerance
- Lack of maintenance
- Ground contact
- Excessive thermal strain
- Exceeding of maximum admissible engine speed
- Exceeding of maximum admissible manifold pressure Vibrations,
impacts, forces, thermal strain etc. could cause cracks on the
crankcase.
WARNING: Rectify any of the
afore mentioned without delay.
1.4) Subject Checking of the
crankcase.
1.5) Compliance
1.5.1) Engine type 912 A and 912 F - Within the next 50 hours of
operation, but at the latest by June I" 2001 the checking of
crankcase must be conducted according to the following
instructions in section 3. - Every 100 hours the checking of
crankcase must be conducted according to the following
instructions in section 3.
1.5.2) Engine type 914 F -
Within the next 50 hours of operation, but at the latest by
January Is' 2002 the checking of crankcase must be conducted
according to the following instructions in section 3. - Every I 00
hours the checking of crankcase must be conducted according to the
following instructions in section
3. 1.6) Company support information - In case of cracks on the
crankcase the complete engine must be returned F.O.B. to a ROTAX,
Authorized Distributor or Service Center. - Shipping cost, down
time, loss of income, telephone costs etc. or cost of conversion
to other engine versions or additional work, as for instance
simultaneous engine overhaul is not covered in this scope and will
not be borne or reimbursed by ROTAX,'
2.3) Material requirement per engine none. The repair has to be
performed by the engine manufacturer.
3) Accomplishment /
Instructions Accomplishment All the measures must be taken and
confirmed by the following persons or facilities: -
ROTAX-Airworthiness representative - ROTAX.- Distributors or their
Service Centers - Persons approved by the respective Aviation
Authority
WARNING: Proceed with this work only in a non-smoking area and not
close to sparks or open flames. Switch off ignition and secure
engine against unintentional operation. - Secure aircraft against
unauthorized operation. - Disconnect negative terminal of aircraft
battery (if a removal of engine is necessary).
3.1) Checking of crankcase: see fig. I Visually inspect the
crankcase (1) and engine suspension for cracks in accordance with
the relevant Maintenance Manual.
NOTE: Scrutinize the crankcase
for cracks especially in the area of cylinder I upper side (2),
between cylinder I and 3 upper side (3) and cylinder 4 lower side
(4). See fig. 1.
For those engines using the
ROTAX, cooling air baffle. Visually inspect for oil leaks in area
(2) and (3). If leaks are found, then further investigation to
determine the cause of the oil leak is required. If the exact
origin of the leak can not be determined i.e. governor, then
removal of the cooling air baffle may be required. Alternative
methods of inspection may be used, i.e. bore scope , to inspect
the areas without removal of the shroud.
NOTE: If absolutely necessary,
and if only a small amount of oil leakage is found, a ferry flight
to a maintenance facility is permitted. At a massive oil leakage
replacement of engine without delay will be necessary. If cracks
are detected the
nearest ROTAX, Authorized Distributor has to be informed and if
necessary the engines has to be removed from aircraft and must be
returned to a ROTAX, Authorized Distributor. Reconnect negative
terminal of aircraft battery (after installation of engine).
3.2) Summary These instructions
(section 3) have to be conducted in accordance with compliance in
section 1.5. A
WARNING: Non-compliance with
these instructions could result in engine damage, personal injury
or death! Approval of translation to best knowledge and judgement
- in any case the original text in German language and the metric
units (SI-system) are authoritative. |
