Honeywell has issued two Category II Reliability Service Bulletins (SB) TFE731-79-3070 R1 and TFE731-79-5120 for the installation of 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
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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.
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Schmitz, Shawn - Engine Tech Rep - Lincoln, NE (LNK). Aviation professional since 2001.
Airframes: Astra, Citation, Falcon, Gulfstream, Hawker, Learjet, Global, Westwind Engines: TFE731, ALF502, AE3007 A/C, APUs, FJ44, Rolls Royce Spey & Tay, Rolls Royce BR700, HTF7000 Direct: +1 402.479.8166 |