WAY better designs  

Sikorsky, Agusta Westland, Bell, MD... ALL have latches that take one SINGLE push or pull to open.  A SINGLE ACTION.

NOT like Airbus/EuroCopter: 1) push in the plastic to uncatch the bar, 2)let the platic cover flip up, 3) grab the round key ring (RIDICULOUS to do is snowy/cold/freezing weather... you have to take your frickin glove off), 4) pull down on the key ring, 5) lift up on the metal tab to uncatch the hooked latch part (which most are spring loaded to whack into your ungloved fingers unless you let the bar back down to it hits into it, 6) THEN you have to hold both bars out of the way while keeping the metal catch from catching on it to lift open whatever cowling you're getting into.

RI - DI - CU - LOUS !!!!!

How about the EPU or other small doors?  You have to push in with your thumb on a CHEAP round metal thing made out of $.02 piece of aluminum and try to rotate it to get it to uncatch.  Worst design ever. 

Almost every other manufacturer uses a butterfly zues fastener that fits that size hole and is WAY easier to open with or without gloves than that stupid push your thumb and rotate into version.