At first I thought it was a problem only with the MH-9 and AH-9 http://feedback.arma3.com/view.php?id=16378 I did not see this problem with the CH-49.
After the last update I made some additional tests with helicopters CH-49, MH-9 and WY-55
and objects: "Box_NATO_Wps_F", "Box_NATO_WpsLaunch_F", "Box_NATO_WpsSpecial_F", "Box_NATO_AmmoOrd_F", "Box_NATO_Grenades_F", "Box_NATO_Ammo_F", "Box_NATO_Support_F"
Each attempt ends with damage of the helicopter and explosion. http://youtu.be/FaAX5uljeDU
The problem does not occur with many other objects, for example: "O_supplyCrate_F", "Land_BarrelSand_F", "Land_MetalBarrel_F"...