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NEWS | Sept. 21, 2023

Apache: Remove Faulty T700 Engine EDECUs

BLUF:  Inspect and remove bad T700 engine EDECUs (PNs 4155T12P07 and 4155T12P08) like it says in H-64-23-ASAM-04.

Soldier in front of Apache helicopter
Photo by Sgt. Sarah Sangster
Mechanics, make a note that in aviation safety action message H-64-23-ASAM-04, you’re required to do a one-time inspection of the Apache T700 engines for bad enhanced digital electronic control units (EDECUs). Faulty EDECUs may result in misleading and erroneous indications to the crew that delay critical emergency actions.
If your helicopter has EDECUs with PN 4155T12P07, NSN 2995-01-572-1860 or PN 4155T12P08, NSN 2995-01-641-8045 installed, they need to be removed and turned in like it says in aviation safety action message H-64-23-ASAM-04.  
Make a note that after 28 FEB 24, the only authorized AH-64 EDECU and common hydromechanical unit (CHMU) configuration will be 4155T12P09 EDECUs and 046T52G42 (6068T97P17) CHMUs.
Follow all the instructions in H-64-23-ASAM-04 for compliance. By 5 SEP 23, units should have made an initial TAMMS-A entry upon receipt of the ASAM that says, "Comply with H-64-23-ASAM-04, Removal of P/Ns 4155T12P07 and 4155T12P08 EDECUs.”

If aircraft were in transit during this period, units have up to 14 days after arrival at their destination to make the initial entry.
To view the detailed instructions for the EDECUS in the ASAM, click HERE.  Click on Consolidated Listings, select Aviation as the Record Type, H-64 as System Type and ASAM as Message Type. Then click Search. Results are listed in chronological order.
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