The 400 Comanche development and testing. The following makes interesting historical reading regarding the 400 Comanche.

by Calvin F. Wilson, Jr; director of Engineering Piper Aircraft Corporation.

The 400 by Walter Jamouneau.

There is more information in the book, "Piper Aircraft" by Roger Peperell.

Piper Service Letter 453 - concerns the engine mount refinishing.

Service Instruction 1444 concerns the Bendix S-1200 series magneto, a service bulletin [dealing with the retard breaker]. A good one to know about; I sent my mags out for OH and they came back without this attended to - how nice! The agency even argued about the existence of this bulletin.

400 PARTS DEPARTMENT

P/N 494-660 Conduit Assembly - $572.45 each [2 -reqd]

I am orchestrating a bulk purchase of this component from Piper; current [01/20/2010] interest is for14 units. The next price break is 25 units; I have requested Piper to quote that quantity but no response yet. The $572.45 price is for a batch of 10 units; I'm hoping for a significant price reduction which hopefully will encourage more buyers. Contact me if you have any interest. this opportunity [price break for purchase of 25 may not happen again].

Flaps: the wire and conduit assembly P/N 494-660 is finally available after my 9-month struggle with the vendor and finally Piper. Pricing is $572.45 each, however i must purchase 10 minimum to get this special pricing. If you plan on keeping your 400 take advantage of this opportunity and put a set on the shelf while they are available.

I know of a few 400 owners complaining about the flap operation, including my 2-year struggle.

Sales Brochure - click above.

Here are a few before and after photos. Click on the photos below for more.

24569-000 before repairs.	24569-000 after repairs.

Induction housing assembly repair brochure; this is the air filter housing. This assembly is not terrifically durable and its condition diminishes over years of service. If you need this repair please plan ahead and warn me to get started on the one I have available exchange. I stay busy and probably won't be able to do yours quickly. I'll determine the repair cost when I examine your assembly. Don't let this get to the point where the repair is not economical; it has happened!

Nearly completed repair procedure - 400 induction housing components; 24569-000 and 24568-000. Still need to install the CamLock™ latch assemblies, and the alternate air door.

Induction housing assembly continued airworthiness brochure

Completed induction housing installed.

It's possible that by repairing and properly sealing this housing assembly [as part of the repair process], one might gain some manifold pressure due to reduced leakage. I can't confirm this but it makes sense to me.

Airborne fuel pump 2B6-26, Piper P/N 757-431; part of fuel pump replacement kit P/N 760-791. Click on the photo above for another view.

If you still have the old Bendix pump, this is Piper's solution.

A few exhaust parts are available.This set is new old stock; when they're gone that's all folks! As of 01/2011 I have 2 sets remaining.

Click on the photo above for more exhaust components.

Here is the installation manual I include with the rebuilt mufflers; there are some tricks. I was able to get the Piper drawings for the mufflers but without dimensions; those missing dimensions were a clue. I measured an original pair of mufflers and came up with the right numbers. Now I have a drawing and have found a shop that has been doing a great job as you can see. I have muffler cores available for rebuild, but I do not stock the rebuilt mufflers. If you need one or the pair let me know and I'll have your order ready as soon as possible.

400 Comanche Boost Pump

• 400 Airborne pump [2B6-26] - this can be a difficult item to locate; however I usually have an overhauled pump available. 35 years ago Piper issued a replacement kit p/n 760-791 to replace the original Bendix pump . If you still have the original Bendix pump and need the Airbrone and the mounting bracket, call me.
• There is a 337 floating around for a replacement Dukes pump; I should be able to capture that as a solution for the non-available 2B6-26 core issue soon. This will allow installation of the replacement pump which can be purchased outright, thus bypassing the difficult issue of finding an Airborne core for exchange or overhaul..
• photo #1 - installation showing special mounting bracket
• photo #2 - end view identification
• photo #3 - plan view identification
• photo #4 - mounting bracket p/n 28080-000 included in Piper kit P/N 760-791. An owner produced part; you ask and I make it for you - $125.00

Nose gear door problem-solver; read this even if you don't know you have a problem with those doors.

This relay is used in the 400 Comanche for the 24-volt staring system. $200.00 each. New old stock; when they're gone you're out of luck.