Honeywell issued a second revision to SB (Service Bulletin) AS907-72-9045 that gives instructions on the installation of an improved annular ball (tower shaft) bearing.
This Reliability SB is applicable to the following Honeywell AS907 series engines:
|
Challenger 300/350 |
AS907-1-1A (HTF7000) |
All |
|
Challenger 350 |
AS907-2-1A (HTF7350) |
Prior to S/N 136556 |
|
Gulfstream G280 |
AS907-2-1G (HTF7250) |
Prior to S/N 130389 |
|
Embraer Legacy 450/500 |
AS907-3-1E (HTF7500) |
Prior to S/N 131309 |
Honeywell developed an improved annular ball (tower shaft), PN 3033024-2, -4 and -6, bearing that utilizes stainless steel rivets to secure the two halves of the bronze cage. Stainless steel provides 60x increased strength that contributes to longer bearing life. The appropriate bearing should be installed when the tower shaft upper bevel gear housing assembly is removed from the engine.
Consult the attached Service Bulletin for more details.
Honeywell also recommends you comply with SB AS907-72-9080, improved No. 4 Roller Bearing, at the same time.
Shawn Schmitz
Engine Tech Rep
Astra, Challenger, Citation, Embraer, Falcon, Global, Gulfstream, Hawker, King Air, Learjet, Westwind Lincoln, NE (LNK)
+1 402.479.8166
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