This is an informational reminder that Honeywell has two Category II Reliability SBs (Service Bulletins), TFE731-79-3070 R1 and TFE731-79-5120, for installing new instruction plate decals on oil tanks to help prevent oil over-servicing.
SB 731-79-3070 R1 is applicable to 731-3/-4/-5/-5B engines
SB 731-79-5120 is applicable to 731-50 engines
 |
At this time, these SBs are not applicable to Falcon aircraft, except the Falcon 50-4.
| Service Bulletin | Complied with | Relevant Engines |
|---|---|---|
| SB 79-3070 R1 | next 600-800 hour routine periodic inspection | 731-3 engines |
| next 300-400 hour routine periodic inspection | 731-4/-5/-5B engines | |
| SB 79-5120 | next scheduled routine periodic inspection | 731-50 engines |
These Service Bulletins are covered by MSP.
Compliance with the SBs will change the part number (PN) of the oil tanks. All oil tanks must be re-identified with the new PN using an electrochemical etch process to a depth of .001”.
Do Not Use VIBROPEEN to re-identify the oil tanks. This will cause the oil tank to be scrapped and not covered by MSP.
For more information, contact Shane Mack, Duncan Aviation Engine Tech Rep at +1 402.479.1511, or via email at Shane.Mack@DuncanAviation.com.
Shane Mack
Engine Tech Rep
Challenger, Citation, Embraer, Falcon, Global, Gulfstream, Hawker, Learjet Lincoln, NE (LNK)
+1 402.479.1511