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. 27, 2020

Shadow: Pitot Tube Discoloration Corrective Action

Shadow taking off in flight
Photo by Maj. Carson Petry

If you’ve been stumped about when it’s time to change out your Shadow’s pitot tube due to  discoloration, check out the good word in TM 1-1550-1689-23&P (Apr 20).
During your preventive maintenance daily (PMD) inspections, pay close attention to the transparency of the Tygon tubing related to your Shadow’s pitot tube system, and make sure the tubing isn’t dry and brittle.

When the tubing becomes discolored over time and loses its transparency, you’ll need to order and replace the tubing lines. But transparency doesn’t mean it’s 100% see through!

Example of discolored pitot tubing

Example of discolored pitot tubing

Example of discolored pitot tubing
Examples of discolored, dry and brittle tubing, which should be replaced
Here are examples of what the tubing should look like:
Example of clear pitot tubing

Example of clear pitot tubing

Example of clear pitot tubing
Tubing should look like this
(Pitot tube assembly, PN 38214-41607-10, in bulk work package)

You can find all the tasks needed to get the replacement job done in TM 1-1550-1689-23&P. Here are the work packages (WPs):
  • Pitot tube assembly – removal work package
  • Pitot tube assembly – installation work package
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