UFC 4-211-01N
25 October 2004
Including change 1, 1 October 2006
CHAPTER 3
ARCHITECTURAL
3-1
GENERAL. Aircraft hangars are comprised of 3 distinct areas; the
hangar bay (OH space), the Shop/Maintenance Area (O1 level); and the
Squadron Administration and Operations area (O2 level). The levels are
designations from shipboard levels and are not specific to the hangar design.
3-2
HANGAR BAY (TYPE 1 HANGAR). (See Figures 3-1 to 3-9 at end
of chapter.) The hangar bay provides "O" level maintenance to aircraft within the
hangar bay. O level maintenance includes removing engines, changing tires,
etc. Layout of this space is determined by the planning documents for the
module configuration identified. The net area of the hangar bay is defined in the
module layout and is considered a fixed area. The hangar bay may not be
increased in size. Recent changes to the criteria have changed the depth of the
bay from 30 m (100 ft) clear to 26m (85 ft) clear. The change allows for
additional width, yet still allows for all Type I aircraft to be accommodated in the
hangar bay. Figure 3-9 shows the different types of Type I aircraft.
Evaluate the height of the hangar bay based on the requirements of
the aircraft expected. The minimum Type I height from the floor to the roof
permanent obstruction line is 10 m (32 ft- 6 in.) Note the bridge crane and
supporting rail structure are exempt from this requirement. Deviation from the
standard hangar height must be approved by NAVFAC EICO, Naval Air Systems
Command (NAVAIR) or Commander Naval Installations (CNI). Evaluation of the
clear height should take into account the expected use. For example, some
aircraft may require a crane and the hook height must be determined after
evaluation of the needs of the squadron. Some aircraft may not require a crane
for maintenance, or there may be other cranes available to perform maintenance
when the anticipation of use is low. See the structural section for additional
information and discussion concerning the types and designs of cranes.
3-3
HANGAR BAY (TYPE II HANGAR). (See Figures 3-10 to 3-17 at
end of chapter.) A Type II hangar generally is the same as the Type I hangar
bay, except that it is for land based or other large aircraft. The function of the
Type II hangar is the same as the Type I hangar but the size of the module is
35.1 m (115 feet) deep x 73.2 m (240 feet) wide. Criteria has not evaluated, nor
anticipated, any changes in the size of the Type II hangar bay for new aircraft
because final aircraft size is not available. Figure3-16 shows the different types
of Type II aircraft.
The minimum Type II height from the floor to the roof permanent
obstruction line is 13 m (42 ft). Note the bridge crane and supporting rail
structure are exempt from this requirement. Deviation from the standard hangar
height must be approved by Naval Facilities Engineering Command's
Engineering Innovation and Criteria Office (NAVFAC EICO,) Naval Air Systems
10
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