Visual Instruments Flap Position Indicator

Installation Instructions

Instructions for Continued Airworthiness

a. DESCRIPTION

b. INSTALLATION AND RIGGING

c. INSTRUCTIONS FOR CONTINUED AIRWORTHINESS

d. TROUBLESHOOTING

a. Description

The Visual Instrument Flap Position Indicator is an electronic indicator utilizing an LED bar graph display to show the position of the wing flaps. The display instrument is similar in size to the OEM instrument and uses the original mounting position and hardware. The flap position transmitter is also similar to the OEM transmitter and is mounted in the right wing using the same mounting bracket and hardware. The electrical wiring for the unit uses existing wiring in the airframe. The LED bar graph on the display instrument is comprised of 9 LED‘s arranged vertically. The top LED is illuminated when power is supplied to the instrument from the main bus. The second LED is illuminated as the flaps move to the 5 degree position and each succeeding LED illuminates with each additional 5 degrees of flap application, until all 9 LED’s are illuminated at the 40 degree position.

b. Installation and Rigging

Please read before installing and wiring your new flap indicating system.

Cessna used two different flap indicating systems during the manufacture of aircraft to which this STC is applicable. One system used two wires from the position transmitter to the indicator the other used only one. Even if the system you removed used only one wire there may be two wires installed in the airframe. It is preferred that two wires be used with the Visual Instrument system but if only one is available the airframe can be used as a ground between the transmitter and indicator. Check your airframe to determine if one or two wires are available then check continuity of the wires with an ohmmeter. Refer to figure 1 while performing the transmitter Installation.

Installation of Transmitter

1. Disconnect aircraft battery.

2. Remove flap transmitter access panel from right wing.

3. Remove courtesy light, on aircraft so equipped.

4. Remove cotter pin from clevis pin and remove clevis pin from transmitter arm.

5. Remove two 3/16 bolts holding transmitter to bracket on wing rib. Disconnect wire(s) and remove transmitter from wing.

6. Install the new transmitter assembly to the wing rib bracket using the 3/16 bolts just removed. If your installation is only using one wire from the transmitter to the indicator leave one bolt finger tight.

7. Attach the new transmitter arm to flap pulley arm using the clevis pin removed in step 3 and a new cotter pin.

8. Attach the large end of the transmitter arm and retaining washer to the potentiometer spindle using 6-32 socket head cap screws and lock washers (supplied). Do not tighten screws at this time.

9. If using two wires, remove factory terminals from airframe wires and install a male blade terminal on one wire and a female blade terminal on the other wire. Connect airframe wires to transmitter lead wires.

10. If using one wire, remove factory terminal from the airframe wire and install a male (Scotch Lok) terminal on the wire. Connect airframe wire to the transmitter lead wire. Remove the other Scotch Lok connector from the transmitter and install a #10 ring terminal. Install this ring terminal under the mounting bolt left finger tight in step 6. Tighten bolt.

Refer to Figure 2 while performing the indicator installation on 200 series Cessna’s

Refer to Figure 3 while performing the indicator installation on 100 series Cessna’s

Installation of Indicator

11. Gain access to rear of indicator and remove wires.

12. Remove 4 nuts holding retaining ring and indicator (Cessna 200 series)

12a.Remove one or two nuts from the back of the indicator and remove the retaining bracket (Cessna 100 series)

13. Remove indicator.

14. Position the new indicator using retaining ring and nuts just removed. Do not tighten nuts. (Cessna 200 series) see figure 2

14a. position the new indicator using the 3000-2300 Retaining Bracket and nylon insert stop nut supplied with the unit. Do not tighten the nut. (Ceasna 100 series) see figure 3

NOTE: indicator will have to be removed after rigging to apply label

15. Using voltmeter, locate and verify airframe power wire. Wire may be marked DB1, DB7 or DB11. Attach this wire to + terminal on new indicator.

16. Using ohmmeter, locate and verify airframe ground wire. Wire may be marked DB6 or DB10. Attach this wire to - terminal on new indicator.

17. To the S terminal of the new indicator, attach airframe signal wire DB5. On aircraft having a two wire system, connect the DB2 wire to the – terminal of indicator. On these aircraft there will be two wires connected to the – terminal. Refer to Drawings B-6000-0700 and B-6000-0800.

Rigging

18. Reconnect battery and turn master switch on. Verify that at least the top LED is lit. If no LED’s are lit, turn master off and recheck wiring.

19. Extend flaps to flaps to the 5 degrees position. Use a protractor confirm flap position.

20. At transmitter, rotate retaining washer until only the top LED is lit. Rotate the washer the opposite direction until the second LED is lit. Tighten 3 sender assembly retaining screws.

21. Extend flaps to the full-down position, then retract 1 degree.

22. Using a small screwdriver inserted in the bottom hole in the indicator face, adjust trim pot until the second from bottom LED just lights up. Note the bottom LED is not used.

23. Retract flaps fully. Verify only top LED is lit. Extend flaps to full-down position and verify that 9 LED’s are lit. If 9 are not lit repeat steps 18 through 23.

24. Remove indicator from panel, and apply applicable self-adhesive label to front. Reinstall indicator, tighten nuts and secure wires. On 100 series Cessna’s use the nylon insert stop nut to install the retaining bracket.

25. Reinstall the courtesy light on aircraft so equipped. Reinstall wing access cover.

26. Make appropriate entry in aircraft maintenance log. Complete enclosed FAA Form 337 and file with your local FSDO. Insert flight manual statement in aircraft POH.

c. Instructions for Continued Airworthiness

This product requires no maintenance other than that specified in the Cessna maintenance manual for this system.

d Troubleshooting

1. No LED’s lit in any flap position.

Check circuit breaker and reset if necessary.

Check for power to the back of the instrument.

Check ground wire on back of the instrument.

2. LED’s do not correspond to actual flap position.

Check mechanical connection between transmitter and flap control arm or pulley.

Check security of transmitter on bracket.

Check rigging of transmitter (see installation and rigging instructions).

Check signal wire from indicator to transmitter for a short to ground.

3. One or more LED’s do not illuminate.

If lower LED’s do not illuminate check rigging of transmitter

If one or more LED’s are not lit with others lit below it, replace indicator.

Check signal wire from indicator to transmitter for open circuit.