Airplane Cabin Moisture Problems: Preventing and Solving Them

Keep Personal Airplane Cabins Dry and Prevent
Corrosion, Rust, Mold, Mildew and Odors

With a tightly sealed cabin and exposure to frequent temperature and humidity changes, personal aircraft make an ideal environment for corrosion, rust, and mold to develop. Personal aircraft owners know how costly corrosion can be to them. During their plane's annual inspection, if any corrosion is found it can cause the plane to lose certification until the issue is resolved. The cost to make those repairs can range from a few hundred dollars to several thousand.

To help reduce the chances of corrosion and rust developing in critical areas like behind the airplane instrument cluster or in the control cable troughs and raceways, simply secure pouches of Dri-It® by their self-adhesive back in those areas to help keep moisture from condensing and thus helping prevent rust and corrosion from forming.

Leave extra pouches throughout the cabin with the printed side exposed to help reduce the overall moisture level and further help to prevent the formation of rust, corrosion and mold developing in the cabin. Moisture will penetrate through the printed label side of the Dri-It pouch. There it is turned into a gel where it is trapped inside the pouch. When a pouch gets full and feels completely ‘gel-like’, simply dispose of it in your standard waste and replace with a fresh pouch.

Dri-It® can also be used in the cargo area to help keep it fresh and dry, and if the airplane is going to be stored and covered for an extended time, pouches placed around the engine compartment will help to control rust and corrosion from forming on the motor. Be sure to remove all pouches from the compartment before the motor is started and do not place pouches directly on a hot engine.

The chart below provides a starting point for the number of pouches needed for different uses.
The ideal amount for your situation will vary depending on many factors, including your normal relative humidity levels; Corrosion/Rust starts forming at 45% RH and Mold & Mildew at 60% RH.
Storage volume is based on 50 cu. ft. (an area 5 ft. x 5 ft. x 2 ft.).


The actual amount you may need will depend on variables such as how many moisture retaining items (seat cushions, floatation devices, etc.) there are, how airtight the cabin is, how often the cabin is opened, etc..
Personal Aircraft Minimum Suggested
Number of Pouches

Private Aircraft (cockpit)

4-6

Private Aircraft (stowage/cargo compartment)

2-4

 

USAGE NOTES:

  • You do not have to worry about over-drying with Dri-It, and you cannot put too many pouches in an area. Dri-It is designed to lower RH no lower than 30%. Extra pouches will simply share the moisture load and extend the time between changing pouches for new ones.
  • When choosing a location to place the Dri-It® pouch, please consider the weight of the "full" pouch. A completely saturated pouch will weigh over 12 ounces. The adhesive on the pouch is designed to hold a full pouch for an extended period of time, however due to temperature fluctuations and other factors (cleanliness of the mounting surface, etc.), the pouch may pull loose after a while.
  • The printed side of the Dri-It® pouch is the side where the moisture enters and is turned into a gel. Blocking this will reduce the effectiveness of the Dri-It material to absorb moisture.
  • Occasionally there is a chemical reaction between the printing on the pouch and different surfaces. To avoid damaging paint, wallpaper or other surfaces, keep the printed side up. Do not place the printed side of the Dri-ItŪ pouch in direct contact with metal.