2016-07-15_8-46-29Today, Rotax released an Alert Service Bulletin (ASB) – ASB-912-069/ ASB-914-051. Exchange of floats on ROTAX® Engine Type 912, 914 and
2-stroke (Series)

See the table below for more details:

Why the ASB:

“Due to a deviation in the manufacturing process of the floats a partial separation of the
outer skin because of resonance vibrations during engine operation may occur. These
separated particles might lead to a restriction of the jets in the carburetor. As a consequence
the fuel supply to the affected cylinder bank may be reduced or blocked. Possible
effects are a rough engine running behavior with reduced fuel flow, up to a major power
loss or engine shut down with blocked fuel flow on the affected carburetor.”

What engines are in this ASB:

All engines of Series 912 A, 912 F, 912 S and 914 F are affected, if at least one of following 3 criteria applies:

Criterion A) Engine Serial number:

Engine type Serial number
912 UL from S/N 6 772 132 up to S/N 6 772 135 incl. / from 6 772 144 up to
6 772 160 incl.
912 ULS from S/N 6 786 001 up to S/N 6 786 013 incl. / from S/N 6 786 017 up to
S/N 6 786 037 incl.
914 UL from S/N 9 575 705 up to S/N 9 575 707,incl. / from S/N 9 575 709 up to
S/N 9 575 720 incl. / from S/N 9 575 724 up to S/N 9 575 743
582 UL from S/N 9 618 523 up to S/N 9 618 557 inclusive / from S/N 9 618 569
up to S/N 9 618 572 inclusive / S/N 9 618 609 / S/N 9 618 610
912 F
from S/N 4 413 066 up to S/N 4 413 067 inclusive
912 S S/N 9 563 830 / S/N 9 563 832 / S/N 9 563 833
914 F from S/N 4 421 572 up to S/N 4 421 590 inclusive

Criterion B) Carburetors:

The part numbers and serial numbers of the carburetors:

Carburetors Cyl. Serial number
912 UL 1/3 Part no. 892500 – from S/N 161138 up to S/N 161143 incl. / from S/N
161483 up to S/N 161490 incl. / from S/N 161493 up to S/N 161507 inclusive
/ from S/N 161516 up to S/N 161518 incl. / S/N 161526
2/4 Part no. 892505 – S/N 162193 / S/N 162194 / from S/N 162196 up to
S/N 162199 incl. / S/N 162205
912 ULS 1/3 Part no. 892530 – from S/N 161528 up to S/N 161531 incl. / S/N 161534
/ S/N 161535 / S/N 161537 / S/N 161542 / S/N 161558 / S/N 161560 /
S/N 161567 / S/N 161568 / S/N 161570 / from S/N 161937 up to S/N
161939 / from S/N 161941 up to S/N 161951 incl. / from S/N 161953 up
to S/N 161980 incl. / from S/N 161982 up to 161989 incl. / from S/N
161992 up to S/N 162042 incl. / from S/N 162044 up to S/N 162051 incl.
/ from S/N 162053 up to S/N 162055 incl. / from S/N 162235 up to S/N
162050 incl. / from S/N 162252 up to S/N 162275 incl. / from S/N 162277
up to S/N 162282 incl. / S/N 162294 / S/N 162298
2/4 Part no. 892535 – S/N 161583 / from S/N 161585 up to S/N 161587
incl. / from S/N 161837 up to S/N 161868 incl. / from S/N 161870 up to
S/N 161873 incl. / from S/N 161875 up to S/N 161919 incl. / from S/N
161921 up to S/N 161936 incl. / from 162102 up to S/N 162120 / from
S/N 162122 up to S/N 162143 incl. / S/N 162145 / S/N 162146 / from
S/N 162400 up to S/N 162411 incl. / from S/N 162413 up to S/N 162430
incl. / from S/N 162432 up to S/N 162435 incl. / from S/N 162437 up to
S/N 162440 incl. / S/N 162442 / S/N 162444 / S/N 162445 / S/N 162449
/ S/N 162450
914 UL 1/3 Part no. 892520 – from S/N 161412 up to S/N 161426 / S/N 161428 /
S/N 161430 / from S/N 161637 up to S/N 161662 / from S/N 161664 up
to S/N 161680 incl. / from S/N 161800 up to S/N 161814 / from S/N
161816 up to S/N 161819 incl. / from S/N 161821 up to S/N 161824 incl.
/ from S/N 161826 up to S/N 161829 incl. / from S/N 161834 up to S/N
161836 incl.
2/4 Part no. 892525 – from S/N 161681 up to S/N 161700 / from S/N 161702
up to S/N 161706 incl. / S/N 161708 / S/N 161709 / from S/N 161711 up
to S/N 161730 incl. / from S/N 161733 up to S/N 161736 / from S/N
161739 up to S/N 161761 incl. / S/N 161765 / S/N 161768 / S/N 161773
/ S/N 161774 / S/N 161777 / S/N 161779
912 A/F 1/3 Part no. 892500 – from S/N 161138 up to S/N 161143 incl. / from S/N
161483 up to S/N 161490 incl. / from S/N 161493 up to S/N 161507
inclusive / from S/N 161516 up to S/N 161518 incl. / S/N 161526
2/4 Part no. 892505 – S/N 162193 / S/N 162194 / from S/N 162196 up to
S/N 162199 incl. / S/N 162205
912 S 1/3 Part no. 892530 – from S/N 161528 up to S/N 161531 incl. / S/N
161534 / S/N 161535 / S/N 161537 / S/N 161542 / S/N 161558 / S/N
161560 /
S/N 161567 / S/N 161568 / S/N 161570 / from S/N 161937 up to S/N
161939 / from S/N 161941 up to S/N 161951 incl. / from S/N 161953
up to S/N 161980 incl. / from S/N 161982 up to 161989 incl. / from S/
N 161992 up to S/N 162042 incl. / from S/N 162044 up to S/N 162051
incl. / from S/N 162053 up to S/N 162055 incl. / from S/N 162235 up to
S/N 162050 incl. / from S/N 162252 up to S/N 162275 incl. / from S/N
162277 up to S/N 162282 incl. / S/N 162294 / S/N 162298
2/4 Part no. 892535 – S/N 161583 / from S/N 161585 up to S/N 161587
incl. / from S/N 161837 up to S/N 161868 incl. / from S/N 161870 up to
S/N 161873 incl. / from S/N 161875 up to S/N 161919 incl. / from S/N
161921 up to S/N 161936 incl. / from 162102 up to S/N 162120 / from
S/N 162122 up to S/N 162143 incl. / S/N 162145 / S/N 162146 / from
S/N 162400 up to S/N 162411 incl. / from S/N 162413 up to S/N
162430 incl. / from S/N 162432 up to S/N 162435 incl. / from S/N
162437 up to S/N 162440 incl. / S/N 162442 / S/N 162444 / S/N
162445 / S/N 162449 / S/N 162450
914 F 1/3 Part no. 892520 – from S/N 161412 up to S/N 161426 / S/N 161428 /
S/N 161430 / from S/N 161637 up to S/N 161662 / from S/N 161664
up to S/N 161680 incl. / from S/N 161800 up to S/N 161814 / from S/N
161816 up to S/N 161819 incl. / from S/N 161821 up to S/N 161824
incl. / from S/N 161826 up to S/N 161829 incl. / from S/N 161834 up to
S/N 161836 incl.
2/4 Part no. 892525 – from S/N 161681 up to S/N 161700 / from S/N
161702 up to S/N 161706 incl. / S/N 161708 / S/N 161709 / from S/N
161711 up to S/N 161730 incl. / from S/N 161733 up to S/N 161736 /
from S/N 161739 up to S/N 161761 incl. / S/N 161765 / S/N 161768 /
S/N 161773 / S/N 161774 / S/N 161777 / S/N 161779

Criterion C) Spare parts:

Further all engines are affected, which have been equipped with floats with the part no.
861185 during engine repair, maintenance or general overhaul as of May 09, 2016.
NOTE:
The carburetor and/or the float may have been removed from the initial engine
and used on another one.
Engines and/or carburetors with serial numbers higher than in criterion A or
B have already been equipped with tested floats.
For relevant information, see the maintenance records and/or the logbook.

When does this work have to be done:

– Before the next flight
– Immediately, on undelivered engines / spare parts
– Before the initial installation of engine and/or spare part

Who can do this work?

All work must be completed by:

– Distributors or their independent Service Centres (iSC)

– In the USA, South and Central Americas, please contact your closest iSC or one of their approved independent Repair Centres (iRC) – See www.rotaxirmt.com for a list.

– Persons with approved qualifications for the corresponding engine type.
– Only certified technicians (iRMT-Level: Line Maintenance) are qualified to work on these engines.

Note:
All work has to be performed in accordance with the relevant Maintenance
Manual.

The Documents:

Please make sure you have the latest version of these documents by going to www.fly-rotax.com.

Initial Release:
ASB-912-069
ASB-914-051

and

ASB-912-069UL
ASB-914-051UL
ASB-2ST-003

The Overview:

Basically, before flying, owners should check to see if their engine serial numbers falls into the above ranges.  If so, in the US, South and Central Americas, contact your closest iSC or one of their iRC.  They will help you will processing this ASB.  Again, www.RotaxiRMT.com to find the closest one to you.