One of the last major avionics projects prior to closing up the cockpit with trim was the installation of the avionics pedestal. This piece is screwed to the floor and has Dzus rails for mounting various avionics including the radio control heads.
Boeing OEM pedestal prior to removal. Note the entire structure was removed prior to tackling this part of the project, given how stuck the fasteners were. Throttle quadrant and flight control removal was delayed until even later, when the floor was in vertical position.
The pedestal itself is a Boeing OEM unit that was installed in the cockpit I originally bought in 2011. Removing the pedestal required a great deal of patience as the screws holding it in place were exposed to the elements for a couple of years while the cockpit was waiting in the boneyard for me to rescue it. PB penetrating catalyst was essential to this task. I stripped the pedestal and refinished it with a self-levelling compound made by 3M. I then painted the unit in the style of an NG model 737, with off white for the body and gray trim around the top. Clear matte spray finish makes for a better appearance and covers up the sandpaper texture of the primer.
Pedestal mount, looking forward. Gray structure at the top is the base of the throttle quadrant. Gray frame in the center of the picture is the pedestal base. As this piece crosses the midline, it was used to index the left and right sides of the floor during reassembly.
The power and USB cables were previously run under the floor back when it was still in vertical position. I chose a combo 12v/5v power supply to provide 12v to the FDS-SYS3 card and 5v for the lighting. This power supply also wound up being used for two USB hubs that wound up inside the pedestal. The backlighting is on a FDS-IBL-DIST-DIM with a FDS-IBL-DIST-EXP card. A 24v power supply was added later when I finished interfacing an OEM fire panel.
Pedestal during installation. Top of frame shows aft part of throttle quadrant and fire panel. FDS-SYS3 interface card mounted on wall on the left, USB hub on the top right. Small interface boards on either side are FDS-IBL-DIST-DIM boards. Avionics modules will be installed on Dzus rails.
After screwing the pedestal back onto the OEM nutplates, I connected the various pedestal modules one at a time. My pedestal has 2x multicom units, 2x NAV radio heads, 2x dummy audio panels, one transponder control, a cargo fire panel, a dummy radar control panel, aileron/rudder trim panel, a door access panel, and a lighting control panel.
Avionics pedestal complete after installation of modules, all manufactured for the simulation market by Flightdeck Solutions except the fire panel seen at the top.
Just after completion of installation of Boeing OEM TQ and pedestal. TQ was heavily modified by Art May-Alyea at Northern Flight Sim, with custom interfacing to provide functionality. Pedestal components by FDS, except the fire panel, which is Boeing OEM.
Having finished the modification of the FMS/CDU bay, I continued my top-to-bottom avionics installation. One of the most critical components, the Boeing throttle quadrant, is located just aft of the FMS/CDU bay.
The TQ I have was purchased several years ago from Art May-Alyea at Northern Flight Sim. Art has a wealth of experience converting old TQs from classic models to closely resemble those used in the NG. He completely disassembles the units, refinishes and paints all the components, installs microswitches to detect every switch position including every detent on the flap lever, then fits the assembly with motors for the trim wheels and throttle levers, as well as servos for the speed brake lever and trim indicator.
Art supplies the TQ conversion with bare wires coming out the front, and interfacing is up to the user. Full details of how I chose to complete the interface will be described in a later post, but the short version of the story is that most of the TQ is connected to a BU0836X joystick controller card from Leo Bodnar. The 12v motor driving the trim wheels are connected to a PhidgetsMotorControl HC card. The throttle levers are driven by two 12v motors fitted with slip clutches and interfaced to two Pololu Jrk 12v12 cards.
The pedestal itself is a Boeing OEM unit that came with the full cockpit I purchased from eBay in 2010. The frame was removed, fully stripped, restored and repainted in the colors of a typical NG model prior to reinstallation. All of the radios and other avionics in the pedestal were provided by FDS, and are purpose built for the simulation market. The one exception is the fire panel in the most forward part of the pedestal frame: this is a Boeing OEM unit that I reverse engineered and will describe in a future post.
Avionics installation in progress. Overhead, MIP and FMS/CDU bay essentially complete. Preparing to install TQ. FO seat installed temporarily to have a place to sit while performing avionics testing. Milk crates used as computer monitor and keyboard stands.
Prior to proceeding with installation of the trim pieces and back wall, I spent several months checking avionics functionality to determine whether I would need to run any additional wires behind any of the panels. Access to the back of the overhead panels is fairly easy thanks to FDS mimicking the OEM design . I didn’t think of everything, but I got most of the major kinks worked out prior to proceeding with the finish work.
FDS forward overhead panel viewed from the forward position. Boeing OEM mount allows the panel to swing down for maintenance access by turning two Camloc fasteners. FDS-SYS1X interface card at the top has capacity for 128 switch inputs and 256 LED outputs. Gauges are by Flight Illusion. Solenoid starter switches at the bottom are Boeing/Cole OEM units interfaced via FDS-SYS-R1X card. Purple wires run to switches and annunciators. Grey ribbon cable to gauges. Yellow and black wires control 5v panel backlighting.
Main instrument panel (MIP) after final installation and alignment of primary flight displays. Empty space at the bottom is for FMC/CDU pedestal.
Happy New Year! It’s been more than six months since my last blog entry, but I have kept very busy fitting avionics into the shell. At the beginning of this phase of the project, I had a general idea of where the various pieces (main instrument panel, mode control panel, EFIS modules, glareshield, and FMC/CDU bay) would wind up, but had to work out a large number of details about how the major components would fit together. The dimensions of a 737NG cockpit are virtually identical to that of the classic model, with one major exception: the FMC/CDU bay of the NG model is almost two inches wider than that of the older models, to accommodate the lower EICAS screen between the two CDUs. The rudder pedal bays are slightly smaller to accommodate this change. I had two FMC/CDU pedestals, a narrow Boeing one that came with my cockpit and a wider, NG size model made for the simulation market by Flightdeck Solutions. The problem could not be easily solved. The FDS pedestal was too wide to fit into the available space without rubbing against the rudder pedals, and the Boeing one was too narrow to accommodate all of the components. So I decided to use the top of the FDS pedestal mated to the bottom of the Boeing unit. I would have to be fairly precise with the cuts. The mated pieces would have to be high enough at the forward edge to meet the main instrument panel (“MIP”) at the right place, and low enough to join up with the throttle quadrant at the aft edge. Furthermore, the rudder pedals needed to be able to clear the enlarged pedestal at the aft end of their travel, and the top, FDS portion would also have to be deep enough to accommodate the FDS CDUs, which sit on wedge shaped bases to allow them to be used as freestanding units on the desktop.
My original plan was to mount the MIP first, so that I would know exactly where to mount the FDS top onto the Boeing bottom. The only problem with this was that the mode control panel (the “MCP” or autopilot control panel) and EFIS control panels needed to be mounted first so that the top of the MIP would be fitted correctly. As I plan to do for all avionics, this unit was first bench tested and fully configured prior to installation. Troubleshooting these units is so much easier before they are installed in the shell.
FDS MCP undergoing testing prior to installation.FDS MCP undergoing testing prior to installation.
The FDS MCP/dual EFIS units are beautifully constructed, sturdy pieces that are faithful to the originals, with precise dimensions on the front faces. In spite of this, the units do not fit on to the Boeing mounts without significant modification. The original mounting brackets are relatively thick given the importance, weight and cantilevered configuration of the autopilot system in the real aircraft.
ClickBond fastener after applying adhesive to the inside of FDS MCP. When the adhesive is finished curing, the orange silicone form is removed, leaving a replaceable #10 nut plate.FO side FDS EFIS module after fitting with ClickBond floating nutplates. After mixing adhesive, the nutplates are held in place with silicone forms that are pulled out after adhesive has cured.
In order to fit the FDS units into the mounts, I cut openings in the sides of the FDS MCP. To take advantage of the Boeing angle brackets, I mounted two #10 nutplates on the inside of the MCP case to allow the mounts to be squeezed together and the screws attached, all without opening the MCP case. For this application I chose an aerospace fastener made by ClickBond, a brilliant, mil-spec system that allows the nutplates to be attached with a two part epoxy, thus avoiding riveting. I also drilled holes in the FDS shelf that holds the MCP and dual EFIS units. I used two large clamps to hold the assembly together while inserting screws from the bottom. Each screw went through the FDS shelf, then through the Boeing angle bracket, and finally into the nutplate mounted on the inside of the FDS MCP.
Large trigger clamps used to install FDS MCP and dual EFIS units onto Boeing mounts.
In each of the FDS EFIS units I mounted two additional floating nutplates, used to fix the units into proper position on the shelf. After mounting these units, I was able fit the FDS glare wings and glareshield and the result was a very clean install that looks great.
Test of under glare shield lighting after installation of MCP and dual EFIS units.
The MIP as originally received from FDS was assembled in their factory as a complete unit and fully wired, including the glareshield, MCP/dual EFIS units, MIP lower EICAS screen and FMS/CDU bay. It was also designed to be a freestanding unit, with easy access to the backside. In order to be able to handle the MIP frame easily, I would need to strip all the avionics out. This required making the avionics much more modular than they came from the factory. I repurposed several AMP cannon plugs salvaged from the Boeing cockpit, splicing them into several large wire bundles connecting the various components. This allowed me to separate the glare wings from the MIP, and also to remove all of the MIP panels from the frame in groups of 3 or 4.
Original Boeing MIP frame in grey, right. Custom fabricated mount for FDS monitor shelf in black, left.
FDS uses a shelf that spans the full width of the MIP to support the monitors used for the displays. These are typical LCD computer monitors with their plastic cases removed. Fortunately this shelf was the exact width of the Boeing opening, so I simply needed to fabricate some brackets to hold the shelf onto the Boeing structure. I built an aluminum support for the Boeing landing gear lever to help support the FDS shelf.
Real Boeing landing gear lever in new position to fit FDS MIP. Aluminum block at the bottom is bolted to FDS monitor shelf.Main instrument panel (MIP) in the process of installation.
After mounting the shelf, I attached the monitors and started a cycle of repeatedly dry fitting the now bare FDS MIP frame to figure out the right angle for the monitors and the proper place in space for the MIP.
