Hangar Familiarization

Question 1

Describe a Type I Hangar:

Answer 1

Type I maintenance hangar is primarily designed for carrier aircraft, but is adaptable to meet requirements for rotary wing and various types of smaller aircraft. The O1 and O2 level spaces in this type of hangar are configured for a typical strike fighter squadron, two carrier airborne early warning squadrons, or a helicopter antisubmarine warfare squadron. The Type I hangar bay module is 235’wide by 85’ deep.

Question 2

Describe a Type II Hangar:

Answer 2

Type II hangar is primarily provided for US Marine Corps Aviation. The hangar is designed to accommodate CH-53 Helicopters, V-22 Ospreys and C-130 Hercules aircraft. This type of hangar may also accommodate Navy versions of the C-130, V-22 and H-53 aircraft. The Type II hangar bay module is 119 feet deep by 325 feet wide.

Question 3

Describe a Type III Hangar:

Answer 3

Type III maintenance hangar is principally designed for land based patrol and large transport aircraft. The Type III hangar module is 165 feet deep by 165 feet wide.

Question 4

There are peculiar items to the shore based hangars, some of the items to be aware of are:

Answer 4

• A painted red fire lane adjacent to the bulkhead that divides the hangar from the maintenance workcenters must be kept clear at all times.
• Portable CO2 fire extinguishers mounted on the bulkhead above the deck.
• Aircraft electrical system with cords for applying external electrical power to aircraft.
• Manually or automatically operated hangar door for securing access to the space and sealing off elements.
• Aircraft grounds that provide a 10ohm or less point to ground and discharge stray voltage are located on a pattern or grid through the hangar deck.

Question 5

Hangar protection requirements for the protection of high value aircraft are:

Answer 5

• A low level AFFF system with low profile nozzles designed for a high degree of reliability and low maintenance requirements.
• A closed head water only overhead sprinkler system designed to protect the building and provide cooling to adjacent aircraft.
• Optical detection system to activate the low level AFFF system.
• Appropriate drainage systems to limit any spill pool size and contain AFFF.
• Draft curtains, to prevent cooling of the sprinkler heads, allowing earlier detection of heat sources.

Question 6

The Estimated cost for a false activation of fire suppression systems would be in excess of $80,000 due to the following:

Answer 6

• Damage to aircraft
• Cost to recharge the system
• Cost of run-off retention
• Cost of AFFF removal
• Associated manpower expenses

Question 7

Carrier Hangars:

Answer 7

The largest hangars are the CVN or aircraft carrier hangar bays; they are 110ft wide by 685 feet long with 25 feet of overhead clearance encompassing 1.4 acres of maintenance and storage space. The hangar bays can hold more than 60 aircraft as well as spare jet engine, fuel tanks, and other heavy equipment. These hangars have divisional doors that can be closed in approximately 18 seconds and isolate the hangar bays into three separate bays to prevent the spread of fire. Hangar bay one and two have aircraft elevators on the starboard side and hangar bay three has aircraft elevators mounted on both the port and starboard side for moving aircraft, large support equipment, and essential supplies to the flight deck.
The hangar bays have AFFF fire protection installed in the overhead like their shore counterparts. Located on the port and starboard bulkheads are the portable fire extinguishing equipment, aircraft external power cables, high pressure air connections, and various ship specific systems.