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B.  The chassis provides the mounting surfaces for connectors, support for two swing-out mounting frames, and a center mounting board.
C.  The center mounting board consists of a removable printed circuit board that contains the power supply, audio amplifier, and RMI driver circuits.
D.  The left swing-out mounting frame supports the VOR/LOC receiver board and the glide slope receiver board. Each board contains tuner, synthesizer, self-test, and injection oscillator circuitry. The VOR/LOC receiver is on the outer board and the glide slope receiver is on the inner board.
E.  The right swing-out mounting frame supports board for interconnections and the remaining VOR/ILS circuits. The VOR/LOC instrumentation and 2 out of 5 circuits, and optional expanded VOR monitor, programmable bearing filter, and digital bearing output circuits are on the inner board. The glide slope instrumentation, digital instrumentation, and optional VOR/ILS self-test and expanded ILS monitor circuits are on the outer board.
3.  VOR/LOC Antenna
A.  The VOR/LOC antenna assembly is a fin cap type installed on top of the vertical stabilizer. The antenna consists of two balanced half loops with a hybrid coupler added for increased reliability under fault conditions. The hybrid coupler is composed of two quarter wavelength lines with the dual outputs to the receivers shunted by a 100-ohm resistor. In addition, a 18.5-inch tuning stub is connected to each half loop.
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H24765
540  ILS Frequency Chart 
Feb 1/74  Figure 2  34-31-0 
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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

4.  GS Antenna
A.  The GS antenna is a single horizontally polarized unit and is installed above the weather radar antenna in the nose radome.
5.  Glide Slope Antenna Director Bar
A.  The glide slope (G/S) antenna director bar is a passive element of the glide slope antenna used to alter the G/S radiation patterns such that the navigation units have maximum glide slope sensitivity.
B.  The bar consists of a 13-inch strip of aluminum foil, pressure sensitive tape, installed horizontally inside the nose radome approximately 22 inches forward of the aft edge of the nose radome top centerline.
6.  Control Panel
A.  The controls for each navigation unit are on separate VHF NAV control panels.
B.  On GJ ALL EXCEPT B-2504, B-2505 and B-2524, the controls on the VHF NAV section of each panel consist of a volume control, two sets of frequency selector knobs with associated frequency displays, three NAV tests buttons and a combination DME function selector and test switch. A transfer (TFR) switch permits selection of either of two preset frequencies.
C.  On GJ B-2504 and B-2505, the controls on the NAV section of each panel consist of two frequency selector knobs with associated frequency display, a volume control, a combination ILS NAV TEST selector switch and VOR test pushbutton and a combination DME function selector switch and DME TEST pushbutton.
D.  On GJ B-2524, the controls on each VHF NAV panel consist of two sets of frequency selector knobs with associated frequency displays and two active display indicator lights, three NAV test switches, a DME function selector, and a DME test switch. A transfer (TFR) switch permits selection of either of two preset frequencies.
7.  VHF NAV Transfer Switch
A.  A toggle actuated transfer switch is installed on the instrument switching panel located on the overhead panel. The switch controls the associated NAV transfer relays which enables VOR/GS system to feed both captain's and first officer's indicator's flight director computers and the autopilot.
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8.  VHF NAV Transfer Relays
A.  The nav transfer relays are stepping type relays. When the VHF NAV transfer switch is in the NORMAL position, the captain is on system No. 1 and the first officer is on system No. 2. Placing VHF NAV transfer switch to BOTH ON 2 position supplies a ground through the contacts of the VHF NAV transfer switch, transfer relay No. 2 and transfer relay No. 1 to the coil of nav transfer relay No. 1. This momentarily energizes transfer relay No. 1 and the relay steps to the BOTH ON 2 position. Positioning the VHF NAV transfer switch back to the NORMAL position, again momentarily energizes transfer relay No. 1 and the relay steps back to the normal position. The first officer's transfer relay is controlled in the same manner as the captain's by positioning the VHF NAV transfer switch to BOTH ON 1.
　
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