Brake Reservoirs - Part 2

This blog covers the installation of the brake reservoirs for the toe brakes 

Overview
The installation of the US manufactured fittings created problems because of the mix of NPT & ISO threads. Access to both reservoirs would be through the inspection panels located in the cowl.

Installation
The first task was to install Aeroflow NPT to BSP elbow adapters to allow the use of the NPT brass fittings. 

The factory supplied reseivors required mounting brackets  these were fabricated from 2024-T3 sheet in a channel with a return tab at the base to carry the weight of the reservoir. with edges were covered using rubber channel.

Brackets

Two [2] M3 rivet nuts were installed from the firewall side match drilled using the fabricated mounts. Once installed the mounts were fixed onto the stem side then fixed with M3 pan head screws with the gap created allowing cable ties [2] to be slid behind and around the reservoir for fixing.

Cylinder Assembly

Both reservoirs were piped using black 3/16'' NSR nylon tube and 1/8'' NPT SAE female  connectors selected to suit the location. 

All threads were treated with Permatex PTFE thread sealant at installation.

To provide strain relief aluminium P clamps were fitted onto the firewall to provide support to the connection located on the rudder pedal. 

Note: All screw threads were treated with thread lock at assembly

P Clamp

The rudder pedals were fully cycled to check operation and to confirm that the pipe would stay retained during operation. 

Comment
Worked as intended but aluminium fitting would have been ideal but none were available to save weight.

Hand Brake - Part 1

This blog cover the installation of a handbrake.

Construction

The valve selected was one on the shelf that close's both ports. To activate the valve a remote cable is fitted onto the lower panel. 

Grove Brake Valve
Part # 06-01261

T-Handle dash control is manufactured from aluminium and brass. Locks positively, will not vibrate loose. One-fourth turn locks it in any position and will hold up to 100 lbs. All part numbers are from Aircraft Spruce Catalog Installation A hole was drilled in the lower panel as detailed on the layout drawing then the handle was installed with the hardware supplied. A mounting bracket was folded from 0.040'' 2024-T3 aluminium, treated and then match drilled to suit the valve. The valve is secured to the bracket using M5 screws and rivet nuts installed into the bracket. Note: Valve mounting holes drilled from 3/16'' [4.8 mm] to 5.5 mm. Valve and mounting brackets Bolts to be trimmed and cable bracket to be riveted The bracket was fitted to the firewall using three [3] 4 x 8 mm and cable attachment was fitted with two [2] 3.2 x 8 mm pop rivets from the firewall side. Next the valve was fitted and the cable offered up to the valve and trimmed to suit. A bracket was then manufactured and fitted with an aluminium clamp fitted to the cable outer and the wire inner terminated into a wire swivel from the parts box. Hand Brake System T handle lock nut replaced with nylock half nut Finishing A suitable label will be printed to suit the operation and fitted under the T handle on a 0.020'' aluminum plate at a later date.