PRE PURCHASE INSPECTION GENERAL MOTORS TBM-3E AVENGER BuNo 53337 sn 3399. June 8th, 2017


BOMB BAY

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The bomb bay doors are in very good condition. The surrounding structure is also decent with areas like this that show the previous mountings and holes for the retardant tank from the fire fighting days

The bomb bay door mechanism in present and functions well but it was installed with non aircraft hardware throughout.

Clean kit pump installed in the forward left side of the bomb bay where the batteries normally mount

Clean kit pump plumbing.

Oil cooler door hydraulic actuator

One example of the grade 8 industrial bolts used in the bomb bay door system. I recommend the proper hardware be installed with castle nuts and cotter pins as per the factory installation.

Interesting use of a plain nut that was drilled for a cotter pin.

Debris in the lower channels of the bomb bay that needs to be cleaned

Red color is from the dye used in the fire fighting retardant.

 

 

Original hardware from the factory

Industrial check valve and hose used instead of aircraft or mil spec material

More red coloring from the fire retardant. which should be removed as it can be corrosive. This is the electrical conduit

Main fuel selector valve left side of the bomb bay. Brown coloring is sealant used for the flange gaskets

Significant fuel leak from the left outboard fuel tank sump fitting. This needs to be fixed and should be a simple repair.

the hook on the left side of the photo below is part of the torpedo support system which is nice to see still installed.

One of the bomb rack rails all of which are still present. Fuel leak visible too

Hydraulic leak from just aft of the pilots seat above weeping into the bomb bay. Rusted springs should be cleaned and preserved/painted/plated

Overall sound structure with little corrosion seen

Dirty areas that will need cleaning and preservation

Upper hose and the one below are also non aircraft industrial type hose. The primary concern is if the rubber is compatible with 5606 hydraulic fluid. Industrial hydraulic oil is not the same and is not compatible with 5606 and causes the rubber seals to swell to twice their size or more

Water from the recent wash job in the bath tub fittings. Cleaning and preservation needed

Some of the original bomb station ID plates are still present

Cleaning and preservation needed in the channels and extrusions where debris accumilates

The battery was located in the aft starboard corner of the bomb bay. It is not the factory location

Bomb bay door actuating cylinder with improper, non aircraft hardware on the pivot points

Bombsight window in the aft bulkhead of the bomb bay. Small door is to reach through to clean off the glass for the bombsight. This would have been optical glass instead of plastic

You need to be aware that the fuel tanks are made of rubber and were self sealing. These tanks are likely 70+years old. There are no decent replacements should they start to leak. You will have to have them made from scratch and this is quite expensive. Besides the fuel leaking at the flange I have not seen any evidence of tank leaking or other problems but having to replace these tanks is an issue facing all of the combat warbirds that had self sealing tanks.

Original WWII Navy style of generator voltage regulator

Even though there is black wing walk painted on the bomb bay doors you should not step on this area. The doors are too rare!

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