Max airspeed limit for cabin doors open with soundproofing.

Max airspeed limit for cabin doors open with soundproofing.

• A. 145 knots
• B. 130 knots
• C. 100 knots
• D. 120 knots

Answer: (C)

Opening a cabin door in flight creates a large flow interaction with the oncoming air, generating significant loads on the door, hinges, latch hardware, and seals. When soundproofing is installed, that door assembly becomes heavier and the door frame slightly less forgiving to wind forces, which reduces the margin before structure or hardware could be stressed or damaged. To keep the door system within safe operating limits and prevent damage from gusts and dynamic pressure, the maximum indicated airspeed with the door open and soundproofing installed is set to 100 knots. At higher speeds the forces would exceed what the door hardware and frame are designed to handle, increasing the risk of door failure or improper latching.

Opening a cabin door in flight creates a large flow interaction with the oncoming air, generating significant loads on the door, hinges, latch hardware, and seals. When soundproofing is installed, that door assembly becomes heavier and the door frame slightly less forgiving to wind forces, which reduces the margin before structure or hardware could be stressed or damaged. To keep the door system within safe operating limits and prevent damage from gusts and dynamic pressure, the maximum indicated airspeed with the door open and soundproofing installed is set to 100 knots. At higher speeds the forces would exceed what the door hardware and frame are designed to handle, increasing the risk of door failure or improper latching.