REAR FIREWALL SAFETY ACCESS DOOR
Improve safety and ease of service to your Skymaster with the addition of a rear firewall engine accessory safety access door
From 1963 to 1972, Skymasters did not have a Rear Firewall Engine Accessory Safety Access Door. This makes it very difficult and time-consuming to service the rear alternator and magnetos.
On 1973-80 models, Cessna installed a safety access door, which makes it much easier and more efficient to service the alternator and magnetos.
We have designed a similar safety access door for the earlier model Skymasters. This is accomplished by making a 14” x 19” cutout in the rear firewall allowing easy access for service without damage to any significant structure (only the firewall and firewall stiffeners are cut).
Additional stiffeners are then installed at the sides of the opening, as well as a flange around the entire opening with anchor plates to reattach the cutout with 6-32 machine screws and a door seal to prevent engine liquids or gases from entering the cabin. (Installation instructions and drawings are included with the kit.)
Items used are approved aircraft aluminum, anchor plates, machine screws, AN rivets and a door seal which meets Mil-1-46852 Types I and II.
Opening in the rear firewall which is standard on a 1977 model P337. This demonstrates the complexity of the wiring to the alternator and the magnetos. In older Skymasters (1972 and older), there is no access panel which makes servicing cumbersome
Rear firewall access added in a 1966 337A allowing ease of access to the rear engine accessories (centered between the two side and at the bottom of the firewall).
1966 337A with rear firewall upholstery over the rear firewall safety access panel as well as the air conditioner evaporator blower above the headliner.