SERVICE BULLETIN SB-032420-C

2. If the measured difference is greater than 1.5°, the actuator, and all mounting hardware (bushings, bolts, etc), must be replaced. Complete SB-012724. Checking the resistance of the NLG stop switches. 1. Verify that master power is off. 2. Disconnect the NLG actuator 8 pin connector shown in Figure 1. 2141 ICON Way, Suite 100, Vacaville, CA 95688 ‐ Tel: 707.564.4000 – www.iconaircraft.com SERVICE BULLETIN SB-032420-C FORM ICA009718-G PAGE 4 of 9 Figure 1 NLG Electrical Connector 3. On the NLG actuator side of the connector the pins are labeled 1-8 as shown below. 4. Using a multimeter, set it to measure resistance (ohms). Measure the resistance between the following pins and record the value: Note: It is important that the meter not be set to just an audible continuity setting. A resistance reading in Ohm, range is required. Table 1 Resistance Measurement of the NLG Stop Switches Between Pins Value if NLG is down Measured Value 2 & 3 Open 3 & 4 < 1 Ohm 2 & 4 Open 5 & 6 Open 6 & 7 < 1 Ohm 5 & 7 Open 5. The resistance value of the above list of pins should be either Open or less than 1 ohm. If you get a value greater than 1 Ohm during any of the resistance checks, then STOP this procedure. - This reading indicates the stop switch is bad. Complete SB-012724 to retrofit to the latest NLG design and replace the actuator. 6. After completing the stop switch resistance checks, reconnect the NLG actuator connector and re- secure the connector to the ty-block using a TY24MX cable tie. The landing gear should be Keyways 2141 ICON Way, Suite 100, Vacaville, CA 95688 ‐ Tel: 707.564.4000 – www.iconaircraft.com SERVICE BULLETIN SB-032420-C FORM ICA009718-G PAGE 5 of 9 swung to confirm satisfactory actuation after reconnecting this connector. Nose Landing Gear Rigging Check (Aircraft Serial Numbers 00001-00011 and 00013-00020) 1. With aircraft wings extended, both HT tips installed, and weight on wheels, check rig with NLG bellcrank manually rotated aft (over-extended position) AND with NLG bellcrank manually rotated forward (under-extended position). a. Note: To manually rotate the bellcrank, have a second technician lift up on the bow handle to reduce the weight on the gear. b. Hold ITL001714 in position. Reference the tool off-of-drag link wrist pin head and bell crank body. Verify drag link is fully in the “in tolerance” window (Figure 2). If within tolerance, move to step 2. c. If not in tolerance (Figure 2), the nose landing gear needs to be re-rigged within the “nominal range” using ITL001714 Rev B and rigging procedure section below. 2. Lift the aircraft nose high enough to slide a block, or equivalent, under the keel allowing the nose wheel to be approximately 1” or greater off the ground. An alternative option is to tip the aircraft lightly onto its tail tiedown lug gently using a towel or cardboard scrap as protection. (Same revision as in “Prep, No. 5”) 3. Ensure that the battery is charged as required in Preparation section, step 4. 4. Verify the 15-amp Main landing gear fuse is removed. 5. Turn the Master switch to “ON”. 6. Move the landing gear handle to the “UP” position. This will result in the NLG actuating to the full up position and stop. Note: The landing gear position indicator will still show “IN TRANSIT” during this operation of the test since the main landing gear is still down. This is normal for this step of the inspection. 7. Move the landing gear handle to the down position. The NLG will actuate to full down and stop. 8. Lift the aircraft nose enough to remove the block, or equivalent, from under the keel or, if resting on the tail tie down lug, allow the aircraft weight to rest onto the nose wheel. Push down on the nose of the aircraft, preloading the nose landing gear, then release. 9. Check the NLG rigging using ICON Tool No. ITL001714 with NLG bellcrank manually rotated aft (over-extended position) AND with NLG bellcrank manually rotated fwd (under-extended position). a. Note: To manually rotate the bellcrank, have a second technician lift up on the bow handle to reduce the weight on the gear. b. If drag link falls within the “in tolerance” range, repeat Steps 2-9 an additional 24 times for a total of 25 times. Reinstall the 15A MLG fuse. c. If the drag link indication is not “in tolerance” (Figure 2), and the nose landing gear has not been re-rigged in step 1, ensure that the battery is charged as required in Preparation section, step 4 and rig the NLG actuator to the “nominal range” using ICON 2141 ICON Way, Suite 100, Vacaville, CA 95688 ‐ Tel: 707.564.4000 – www.iconaircraft.com SERVICE BULLETIN SB-032420-C FORM ICA009718-G PAGE 6 of 9 Tool No. ITL001714 by following the procedure in the ICON A5 Maintenance Manual (ICA000833, section 100391 or 100392) and repeat steps 2-9 of this section 24 additional times. Reinstall the 15A MLG fuse. d. If at any time the NLG has been re-rigged once during this process and the drag link falls outside the “in tolerance” range during the 25 NLG cycles, the actuator stop switch is not functioning correctly. Complete SB-012724 to replace the actuator and retrofit to the latest NLG design. Figure 2 ITL001714 Rev B Indexed on NLG Bellcrank showing the drag link within the "in tolerance" range. 2141 ICON Way, Suite 100, Vacaville, CA 95688 ‐ Tel: 707.564.4000 – www.iconaircraft.com SERVICE BULLETIN SB-032420-C FORM ICA009718-G PAGE 7 of 9 Figure 3 Summarized flow chart of the NLG rigging test procedure using ITL001714 Rev B Nose Landing Gear Rigging Check (Aircraft Serial Numbers 00012, 00021 and subsequent) 1. With aircraft wings extended, both HT tips installed, and weight on wheels, check rig with NLG bellcrank manually rotated aft (over-extended position) AND with NLG bellcrank manually rotated fwd (under-extended position). a. Note: To manually rotate the bellcrank, have a second technician lift up on the bow handle to reduce the weight on the gear. b. If a 0.163-inch rigging pin can be inserted into the NLG rigging hole and pass through the bellcrank and drag link (Figure 4), then proceed to step 2 of this section. c. If a 0.163-inch rigging pin cannot be inserted into the NLG rigging hole (and pass through the bellcrank and drag link), then the nose landing gear needs to be re-rigged using a 0.1885”-0.1875” rigging pin in accordance with the ICON A5 Maintenance Manual (ICA000833, section 100391 or 100392). 2. Lift the aircraft nose enough to slide a block or equivalent under the keel to allow the nose wheel to be approximately 1” or greater off the ground. An alternative option is to gently tip the aircraft nose slightly upward, using a strap on the tail tiedown lug. An alternative option is to gently tip the aircraft nose slightly upward, using a fabric strap on the tail tiedown lug and a towel or cardboard beneath the tie down lug. 3. Ensure that the battery is charged as required in Preparation section, step 4. 4. Verify the 15-amp Main landing gear fuse is removed. 5. Turn the Master switch to “ON”. 6. Move the landing gear handle to the “UP” position. The NLG will move to the full up position and stop. 2141 ICON Way, Suite 100, Vacaville, CA 95688 ‐ Tel: 707.564.4000 – www.iconaircraft.com SERVICE BULLETIN SB-032420-C FORM ICA009718-G PAGE 8 of 9 Note: The landing gear position indication will still show “IN TRANSIT” during this test since the main landing gear is still down. This is normal for this inspection. 7. Move the landing gear handle to the down position. This actuates the NLG to the full down position and stops. 8. Lift the aircraft nose enough to remove the block or equivalent from under the keel and allow weight back on to the nose wheel. Push down on the nose to preload the landing gear then release. An alternative option is to gently tip the aircraft nose slightly upward, using a fabric strap on the tail tiedown lug and a towel or cardboard beneath the tie down lug. 9. Check the NLG rigging using a 0.163-inch rigging pin with NLG bellcrank manually rotated aft (over-extended position) AND with NLG bellcrank manually rotated fwd (under-extended position). a. Note: To manually rotate the bellcrank, have a second technician lift up on the bow handle to reduce the weight on the gear. b. If a 0.163 in rig pin can be installed into the NLG rigging hole, repeat Steps 2-9 of this section an additional 24 times for a total of 25 times. Reinstall the 15A MLG fuse. c. If a 0.163-inch rig pin cannot be installed, and nose landing gear has not been re-rigged in step 1, rig the NLG actuator using a 0.1885-0.1875 rigging pin in accordance with the ICON A5 Maintenance Manual (ICA000833, section 100704) and repeat steps 2-9 of this section, 24 additional times. Reinstall the 15A MLG fuse. d. If at any time the NLG has been re-rigged once during this process and 0.163 in. rig pin is unable to be inserted during the 25 NLG cycles, the actuator stop switch is not functioning correctly. Complete SB-012724 to replace the actuator and retrofit to the latest NLG design. Figure 4 Location of the NLG rig pin hole. 2141 ICON Way, Suite 100, Vacaville, CA 95688 ‐ Tel: 707.564.4000 – www.iconaircraft.com SERVICE BULLETIN SB-032420-C FORM ICA009718-G PAGE 9 of 9 Figure 5 Summarized flow chart of the NLG rigging test procedure using a rig pin. Logbook Entry: “I hereby certify the inspection and/or repair has been completed in accordance with Service Bulletin (SB-032420-C, Recurring Inspection of Nose Landing Gear (NLG) Actuator Rigging and NLG actuator Stop Switches) and all referenced documents. Potentially unclear procedures have been clarified with ICON Aircraft. (ref. FAA Exemption 10829C)”. For aircraft registered outside the U.S., omit “(ref. FAA Exemption 10829C)” If you have questions, comments, or concerns about this Service Bulletin and/or if you are no longer owner/operator of this aircraft, please forward this information to the present owner/operator and notify ICON Aircraft at: ICON Aircraft 2141 ICON Way, Suite 100 Vacaville, CA 95688 (707) 564-4000 support@iconaircraft.com Please include the aircraft registration number, serial number, your name, and if known the contact information of the new owner/operator.