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Electromagnetic compatibility test |
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|  MIL-T-18847C(AS)
4.6.15.3 Humidity exposure. The tank shall be tested in accordance with
MIL-STD-810, Method 507.2, Procedure I.
4.6.15.4 Salt fog test.
The tank shall be tested in accordance with
MIL-STD-810, Method 509.2.
4.6.15.5 Sand and dust test.
The tank shall be tested in accordance with
MIL-STD-810, Method 510.2.
4.6.15.6 Electromagnetic compatibility test. The tank assembly shall be
tested in accordance with MIL-STD-462 to demonstrate that extraordinary
precautions are not required against Hazards of Electromagnetic Radiation
(HERO).
4.6.16 Load tests. Load tests shall be performed to demonstrate that the
tanks, at the weights specified in 3.5.1.5.2, shall withstand 1.15 times the
load factors without permanent deformation in accordance with MIL-A-8591.
4.6.16.1 Ultimate loads. The tank shall be subjected to the ultimate load
factor and aerodynamic loads without failure (see 3.5.1.5). The tank shall
then be tested to failure under the most critical condition as identified in
the stress analysis.
4.6.17 Forced ejection test. To investigate ejector mechanism penetration
to Type I, the tank shall be filled with water to the usable fuel capacity and
shall be subjected to a forced ejection onto a soft surface. The ejector
mechanism shall not penetrate the tank. For Type H, the tank shall be filled
with water to the usable fuel capacity and shall withstand one release from
the forced ejection mechanism onto a concrete surface 48 2 inches below the
tank centerline. The ejector mechanism shall not penetrate the tank. The
tanks shall not rupture or leak.
4.6.18 Internal fuel vapor ignition test. A tank suspended from a bomb
rack shall withstand the explosive pressures caused by rapid ignition of an
N-pentane air mixture (see 3.15.3). The explosion shall produce a pressure
peak rise of at least 6.5 atmospheres within 60 milliseconds; no structural
damage is permitted. If an Incendiary projectile is specified as an ignition
source, only projectile penetration damage is permissible.
4.6.19 Ballistic. The tank shall withstand the loads generated from
internal Ignition pressure when impacted by a 14.5 mm Armor Piercing
Incendiary (API) service velocity projectile (see 3.15.2). The projectile
impact shall not yield an entrance or exit orifice wound larger than the
projectile contact frontal area. Structural damage is permitted but leakage
shall occur only from the entrance or exit.
4.6.20 Fuel fire test. The tank shall contain the JP-5 while suspended in
an open pit fuel fire of MIL-T-5624 grade JP-4 for 15 minutes without rupture
(see 3.15.4). The centerline of the tank shall be 36 2 inches above the
fuel ground line.
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