And NEW Service Instructions For 912 & 914 Series Engines]
Hear ye,
FWIW,
Regards,
Gilles Thesee
Grenoble, France
http://contrails.free.fr
-------- Message original --------
Sujet: Release of REVISED MANDATORY Rotax Service Bulletins And NEW
Service Instructions For 912 & 914 Series Engines
Date: Tue, 12 Sep 2006 16:09:32 -0700
De: updates@rotax-owner.com <updates@rotax-owner.com>
Rpondre : updates@rotax-owner.com
Pour: gilles.thesee@free.fr
Dear Registered User;
The following REVISED MANDATORY SERVICE BULLETINS have been released by Rotax:
SB-912-043
SB-914-029
SB-912-043UL
SB-914-029UL CHANGE OF COOLANT SPECIFICATION ON ROTAX ENGINE TYPE 912 AND
914
(SERIES)
These new Service Bulletins may be downloaded from www.rotax-owner.com
SB-912-043 -
http://www.rotax-owner.com/si_tb_info/getdoc.asp?USERID=aiprt&DOCID=SB-912-043&S_TYPE=NW
SB-914-029 -
http://www.rotax-owner.com/si_tb_info/getdoc.asp?USERID=aiprt&DOCID=SB-914-029&S_TYPE=NW
SB-912-043UL -
http://www.rotax-owner.com/si_tb_info/getdoc.asp?USERID=aiprt&DOCID=SB-912-043UL&S_TYPE=NW
SB-914-029UL -
http://www.rotax-owner.com/si_tb_info/getdoc.asp?USERID=aiprt&DOCID=SB-914-029UL&S_TYPE=NW
** Important Note!
Rotax releases separate Service Bulletins for non-certified engine models.
These
service bulletins only contain information regarding the non-certified engine
models affected by the service bulletin.
Full service bulletin information and instructions are found in the certified
service
bulletin (without the UL designator).
Owners and operators of non-certified engine models must download and review
both
the certified and UL versions of the service bulletin to obtain complete service
information.
SB-912-043 R1 /SB-914-029 R1 also requires the revision of several operator's
and installation manuals. As service to Rotax Owners Association News users,
these manual updates have been posted to the Rotax Owners Association News web
site ( www.rotax-owner.com/manualrev/09_11_2006/mrSB9_043_029R1.htm )
------------------------------------------------------------------------------------------------
In addition the following NEW SERVICE INSTRUCTIONS have been released by Rotax:
SI-912-016
SI-914-019 SELECTION OF SUITABLE OPERATING FLUIDS FOR ROTAX ENGINE TYPE 912
AND 914 (SERIES)
These new Service Instructions may be downloaded from www.rotax-owner.com
SI-912-016 -
http://www.rotax-owner.com/si_tb_info/getdoc.asp?USERID=aiprt&DOCID=SI-912-016&S_TYPE=NW
SI-914-019 -
http://www.rotax-owner.com/si_tb_info/getdoc.asp?USERID=aiprt&DOCID=SI-914-019&S_TYPE=NW
------------------------------------------------------------------------------------------------
Supplemental Information for Rotax Service Bulletins SB-912-043 R1 / SB-914-029
R1
This supplemental information is intended to provide additional background
regarding
the changes to the coolant specification as set out in Rotax Service Bulletins
SB-912-043 R1 / SB-914-029 R1.
THIS SUPPLEMENTAL INFORMATION IS GENERAL IN NATURE AND IS NOT INTENDED TO
REPLACE
THE INFORMATION PROVIDED IN THE SERVICE BULLETINS.
ALL OWNERS, OPERATORS AND MAINTENANCE PERSONNEL SHOULD OBTAIN AND CAREFULLY
REVIEW
THE FULL TEXT OF EACH SERVICE BULLETIN.
After an investigation into a few isolated field reports, it was discovered that
in some instances conventional 50/50 water - glycol coolant mixture could begin
to boil off before the maximum cylinder head temperature was reached.
To address this issue and maintain the highest level of flight safety, Rotax
issued
the initial version of Service Bulletin SB-912-043 / SB-914-029 in September
2004. This bulletin changed the coolant specification for the 912 & 914 engines
---From a 50 / 50 water - glycol mixture to a 'waterless' coolant with a much
higher boiling point. This change was made to insure that coolant boil off
could not occur in any circumstances provided that the engine CHT limits were
respected.
Subsequent to the initial release of Service Bulletin SB-912-043 / SB-914-029,
Rotax has continued to examine this issue, and now recognizes that for some 912
& 914 engine installations conventional 50/50 water - glycol mixture coolant
may be a viable alternative. Conventional 50/50 water - glycol coolant solution
is inexpensive, readily available and has excellent heat transfer properties.
Understanding the benefits provided by conventional water - glycol coolant in
some
applications, Rotax has now released a new revision of Service Bulletin
SB-912-043
/ SB-914-029. With the release Service Bulletin SB-912-043 R1 / SB-914-029
R1, use of conventional 50/50 water - glycol coolant is once again allowed,
provided certain conditions can be met.
In order for a 912 or 914 series engine to be safely operated with conventional
water - glycol coolant, SB-912-043 R1 / SB-914-029 R1 mandates that both
cylinder
head temperatures AND coolant exit temperature must be monitored at all times.
Coolant exit temperature must never exceed the boiling point of 50/50 water
- glycol coolant mixture AND engine cylinder head temperatures must never
exceed the maximum permissible values set out in the appropriate engine
Operators
Manual.
To meet these requirements a coolant temperature sensor and cockpit mounted
coolant
temperature gauge must be installed in addition to CHT instrumentation.
The coolant temperature sensor must be installed in the coolant line between the
outlet of the expansion tank and the inlet of the coolant radiator (please
refer to the Cooling System section of the appropriate engine installation
manual
for more details). Installation of the coolant temperature sensor must not
impede or restrict the coolant flow. The installed coolant temperature gauge
must be appropriately marked with the maximum allowable coolant exit
temperature.
Installation of the coolant temperature sensor and gauge will allow the pilot to
monitor the coolant temperature throughout the entire engine operational range.
If for any reason the coolant temperature approaches or exceeds the maximum
permissible value (approx. 120? C (248? F) in a cooling system pressurized
to 18 psi (1.2 bar)) the pilot will be able to take the appropriate action
(reduce
power setting and / or terminate flight).
Once again, installation of a coolant temperature gauge DOES NOT alter the
requirements
for the monitoring of engine cylinder head temperatures and respecting
published CHT limits.
In some aircraft installations, the liquid cooling system may not be able to
maintain
a coolant exit temperature below the boiling point of conventional 50/50
water - glycol coolant. This may be due to the size of the coolant radiator,
the design of the engine cowling, operating profile, or other related factors.
In applications where the coolant exit temperature may exceed the boiling
point of conventional water - glycol coolant, SB-912-043 R1 / SB-914-029 R1
requires
the use of 'waterless' coolant only.
When 'waterless' coolant is used, monitoring of the coolant exit temperature is
not required. The boiling point of the 'waterless' coolant is higher than the
maximum allowable cylinder head temperature, therefore the coolant cannot be
boiled off without exceeding the engine CHT limits.
Use of 'waterless' coolant DOES NOT alter the requirements for the monitoring of
engine cylinder head temperatures and respecting published CHT limits.
In cases where 'waterless' coolant is used and engine cylinder head temperatures
exceed the maximum permissible values, the coolant system must be repaired or
modified in such a manner as to increase the cooling capacity of the system.
More information regarding coolants for 912 & 914 series engines, including
recommended
brand names, can be found in Rotax Service Information SI-912-016 / SI-914-019
(August 2006). All owners & operators of 912 & 914 series engines should
obtain a copy of this Service Information document.
If there is any question regarding the selection of the correct coolant for a
particular
engine installation, the engine owner / operator is strongly encouraged
to contact the nearest authorized Rotax Service Center or their aircraft
manufacturer.
-----------------------------------------------------------------------------------------------
This e-mail update is provided as a free service to registered users.
Register with Rotax Owners Association News today!
|