UFC 3-410-04N
25 October 2004
CHAPTER 10
AIRCRAFT CORROSION CONTROL HANGARS
10-1
FUNCTION. Aircraft corrosion control hangars provide space and
equipment for the corrosion control processing of aircraft. Processes include: deicing,
limited detergent washing and rinsing, paint stripping, corrosion removal, protective
coating application and painting, and finish curing and drying.
10-2
OPERATIONAL CONSIDERATIONS. See paragraph 9-2 for spray paint
operation considerations.
10-3
DESIGN CRITERIA. Design hangars in accordance with MIL-HDBK-
1028/1, Aircraft Maintenance Facilities and the specific ventilation system design
requirements in this Chapter.
10-3.1
Exhaust Air System. The ventilation system for an aircraft corrosion
control hangar is mainly to prevent fire and explosion. A well-designed ventilation
system will also reduce paint overspray, help control workers' contaminant exposure,
and protect the paint finish. Workers must use appropriate respiratory protection
irrespective of the airflow rate. On 8 April 1997 and 1 July 1999, OSHA issued
interpretations of 29 CFR 1910.94 and 1910.107 for determining the airflow rate
required for an aircraft corrosion control hangars. In accordance with OSHA's
interpretation letters, see Appendix D, an aircraft corrosion control hangar must
minimally comply with the requirements of NFPA 33 and with Subpart Z of 29 CFR 1910
for hazardous substances.
NOTE U. S. Army: Army facilities will be designed to the requirements of
29 CFR 1910.94 and 1910.106 as well as NFPA33 and Subpart Z of 29 CFR 1910.
10-3.1.1
Painting Mode. Design the volumetric airflow rate to keep the
concentration of vapors and mists in the exhaust stream of the ventilation system below
the 25 percent of the LEL. See 29CFR1910.94(c)(6)(ii) for an example of airflow rate
requirement calculations. However, this calculated airflow rate often is too low to
capture the paint overspray. Do not re-circulate exhaust air while painting.
NOTE U. S. Army and U.S Air Force: Recirculation of exhaust air may
be considered provided requirements of ANSI Z9.7, NFPA 33, ASHRAE, and OSHA are
met.
10-3.1.2
Drying Mode. Review the paint drying requirements before specifying
temperature and humidity ranges. Consider maintaining the airflow rate at the same
level as in the painting mode for the simplicity of the system. However, a lower
ventilation airflow rate can be used for the drying mode to conserve energy.
Recirculation of exhaust air can be used if sufficient outside air is provided to keep the
concentration of vapors and mists in the exhaust stream of the ventilation system below
10-1
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