An official website of the United States government
Here's how you know
A .mil website belongs to an official U.S. Department of Defense organization in the United States.
A lock (lock ) or https:// means you’ve safely connected to the .mil website. Share sensitive information only on official, secure websites.

Home : Articles
Would you stake your life, right now, on the condition of your equipment?
NEWS | March 2, 2023

Chinook: Prevent Transmission Corrosion

BLUF:  Prevent Chinook transmission corrosion during shipping by using the procedures in the IETM, TM 1-1520-271-23&P (15 Feb 23).
Chinook in hangar for maintenance.
Photo by Charles Rosemond
This article initially appeared in PS 773 (Apr 17), pp. 18-19.

Mechanics, when removing a Chinook transmission for shipment or storage, corrosion prevention is a must. Static corrosion is happening between the time a transmission is placed in a shipping or storage container and when the container is opened at the depot for overhaul.
The corrosion problem has been found in these transmissions:
Item NSN 1615-01-
Aft transmission 315-4071
Combining transmission 464-3974
Engine transmission 464-7113*
Forward transmission 317-6446

To correct the problem, follow the corrosion procedures in the latest update to IETM, TM 1-1520-271-23&P (15 Feb 23).
Follow these steps before shipping a transmission:
  1. Check all transmission surfaces for corrosion, cracks, chipped paint and bare surfaces.
  2. Spray corrosion preventive compound (CPC) onto corroded surfaces, areas of chipped paint, exposed metal and into visible cracks.
  3. Put the transmission into its shipping and storage container.
Make a note that the CPC in the expendable materials section of the TM is an improved formula. Check out the chart below:
TM 1-1520-271-23&P, CH-47F
Item Old NSN/PN New NSN/PN Qty
E156 8030-01-347-0979 (MIL-DTL-85054C) 8030-01-347-0980 (MIL-DTL-85054) 11-oz Can
E157 8030-01-347-0980 (MIL-DTL-85054C) 8030-01-347-0981 (MIL-DTL-85054) 1 quart
When spraying CPC, be aware of the product warnings and cautions and always make sure you wear the proper safety and breathing equipment.

Aerosol, MIL-DTL-85054, is flammable and toxic. In can irritate skin and cause burns. Use only in a well-ventilated area, away from heat and open flame.
In case of contact, immediately flush affected skin and eyes with water for at least 15 minutes. Get medical attention for eyes. Ensure you read and understand the safety and data sheet (SDS).
Aerosol, MIL-DTL-85054, is not compatible with corban-35! Mixing will compromise the corrosion protection required. 
Editor’s Notes:

* This NSN has been updated from the original article.

Other minor changes have been made to reflect the fact that information contained in a maintenance action message has now been incorporated into the TM. Also, references to the CH-47D have been removed.
Want to get better search results faster? 
Click the link below to access our "how to" guide
After entering a keyword, you must hit or click the Search bar/box below for the function to work.
Simply hitting Return won't yield results.
Note about links to archive articles

If you come across a link to a pre-2014 PS Magazine issue or article that uses LOGSA in the web address (URL), use this link instead:
For issues/articles from 2014 and after, click on the Archive/Index tab in the top menu of this website.

BE ADVISED: With the migration to Army365, emails in older articles may still reflect an address. To update, change the domain to