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 | Aug. 20, 2021

AH-64D/E: Protecting Your TADS/PNVS Time Delay Unit

AH-64D Apache
Photo by Sgt. Sarah Sangster
Mechanics and operators, if you’re seeing screen degradation on the Target Acquisition Designation Sight/Pilot Night Vision Time Delay Unit (TADS/PNVS TDU), that’s a sign of a breakdown in the polarization layer of the unit caused by exposure to sunlight or solar radiation, as well as heat and humidity. To learn more about potential mission impacts of this damage, click on the link below to read a message from the product director:
Protecting the TDU from this type of damage is simple. Use the cover, NSN 1270-01-571-0298 (PN 76502623-001), to protect the TDU. The cover prevents or eliminates degradation.
Use cover to protect screen
Use cover to protect screen
Every new aircraft coming off the production line since 2007 has been issued a TDU cover and is a part of the aircraft flyaway gear. It is also included on the DA Form 2408-17, Aircraft Inventory Record.

Make a note that a publication update is in the works for the Interactive Electronic Technical Manual (IETM) TM 1-1520-Longbow/Apache, EM 0126 (May 21), to add the remove and install instructions for the TADS cover.

Got questions about TADS/PNVS? Contact the Apache Sensor Sensors Project Office POCs, Wayne Bubnick and Emily Austin, by email:
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