SERVICE BULLETIN M20-344

The position of the gear is indicated by lights (green or red/amber) on the panel which will warn the pilot of an unlocked condition. These lights may be dimmed by rotating the lens housing to prevent glare at night. Press the lens housing in, to test the bulbs. The red/amber indicator light will come on if the retrac- tion handle is not sufficiently engaged in a “down- lock” position (see Figure 32- 1), thereby indicating an un- safe- to- land condition or when transitioned to the “up- lock” position (see Figure 32- 2). In some cases the down lock assembly can be badly worn causing in- advertent engagement (see Figure 32- 3). When new or freshened interiors are completed, check the proper engagement of the retraction handle and lock assem- bly are recommended. HANDLE NOT SECURED LOCK BUTTON NOT ENGAGED RETRACTION HANDLE NOT ENGAGED FIGURE 32-1 GEAR UP “AMBER/RED LIGHT” FIGURE 32-2 MOONEY INTERNATIONAL SERVICE BULLETIN 165 Al Mooney Road North Kerrville, Texas 78028 SERVICE BULLETIN M20-344 Date: November 28, 2022 CORPORATION THIS BULLETIN DOES NOT CHANGE AIRCRAFT TYPE DESIGN MOONEY INTERNATIONAL CORPORATION - 165 Al Mooney Road North, Kerrville, Texas 78028 tel: 830-896-6000 www.mooney.com Page 4 of 7 HANDLE WEAR MARKS DOWN LOCK ASSEMBLY - WEAR MARKS FIGURE 32-3 The green light indicates that the handle is properly en- gaged in the down lock position (see Figure 32- 4), and the gear is in the landing configuration. A thumb oper- ated latch is provided on the down lock socket to pre- vent unlocking of the gear when it is down unless it is deliberately released (see Figure 32- 5). GEAR LOCK “GREEN LIGHT” FIGURE 32-4 HANDLE SECURED LOCK BUTTON LOCKED GEAR DOWN LOCK - HANDLE SECURED FIGURE 32-5 -CAUTION- It is important to to check between the pilot and copilot seats for any items that would interfere with the landing gear retraction or extension movement. If a front passenger is not present, latch the lower seat belt buckle. This prevents the seat belt overlap- ping the retraction handle. MANUAL LANDING GEAR OPERATION To retract (raise) the gear, depress the safety latch but- ton and slide the gear handle from the down lock sock- et (see Figure 32- 6). With a firm and positive motion, rotate the gear handle rapidly to the floor between the seats without stopping (see Figure 32- 7). At the end of the gear handle travel, slide handle sleeve rearward into the floor Up- Lock latch as shown in Figure 32- 8. The gear retraction is easiest at slower airspeeds. With the gear retracted, the red unsafe gear light will be visible at all times. This light is operated by a switch located in the socket of the gear down lock. Gear extended (lowering) the gear, slide the gear han- dle from the up- lock socket (see Figure 32- 8), and move the handle in a forward motion toward the instru- MOONEY INTERNATIONAL SERVICE BULLETIN 165 Al Mooney Road North Kerrville, Texas 78028 SERVICE BULLETIN M20-344 Date: November 28, 2022 CORPORATION THIS BULLETIN DOES NOT CHANGE AIRCRAFT TYPE DESIGN MOONEY INTERNATIONAL CORPORATION - 165 Al Mooney Road North, Kerrville, Texas 78028 tel: 830-896-6000 www.mooney.com Page 5 of 7 ment panel. Allow the handle to rotate through the palm of your hand as you did while retracting. Engage the gear handle into the down- lock socket and check the gear warning light for a gear- down indication (a Green light). The more rapid the movement of the han- dle, the easier it is to extend the gear. The gear exten- sion is easiest at higher airspeeds. -NOTE- Warning horn will sound if gear is not down and locked, and throttle is retarded. Check for green “Down Lock” light. If green light is not working, it can be unscrewed and replaced in flight with the red “Gear Up” light to verify the locked posi- tion. GEAR UNLOCK - PUSH BUTTON RELEASE FIGURE 32-6 LANDING GEAR HANDLE FIGURE 32-7 LANDING GEAR HANDLE UPLOCK FIGURE 32-8 MANUAL LANDING GEAR SYSTEM - SERVICE AND MAINTENANCE The landing gear retraction system should be rigged only by a mechanic familiar with the Mooney gear rig- ging procedures found in the current FAA approved Mooney Service and Maintenance Manual. The land- ing gear should be kept free of mud or ice to prevent interference when retracted. If you notice an unusual force when operating the manual retraction system, re- turn the lever to the down and locked position and have the gear checked after landing. The gear warning horn may be checked in flight by retarding the throttle with the gear up. The horn should sound at about ten inches Hg manifold pressure. MOONEY INTERNATIONAL SERVICE BULLETIN 165 Al Mooney Road North Kerrville, Texas 78028 SERVICE BULLETIN M20-344 Date: November 28, 2022 CORPORATION THIS BULLETIN DOES NOT CHANGE AIRCRAFT TYPE DESIGN MOONEY INTERNATIONAL CORPORATION - 165 Al Mooney Road North, Kerrville, Texas 78028 tel: 830-896-6000 www.mooney.com Page 6 of 7 ELECTRIC GEAR SYSTEM - 1975 AND LATER (NON- GLASS PANEL) The electrical landing gear retraction system is operat- ed by the white wheel- shaped switch on the upper por- tion of the flight panel. To raise the gear, the knob is pulled out and the switch moved up to it’s upper de- tente. An “airspeed switch” is incorporated in the elec- trical circuit which prevents landing gear retraction un- til a safe airspeed is attained. The action of the system may be monitored visually by watching the movement of the indicator through the glass in the floorboard, aft of the nose wheel well. A limit switch will stop the gear in its retracted position and the gear switch will require no further attention until landing. To lower the landing gear, the knob is pulled out, moved down, and placed in the lower detente. A limit switch will stop the gear system when the proper locking force has been exert- ed to hold the gear down. There are three ways to check that the gear is completely down and locked: 1. The green “Safe- to- land” indicator light (on left panel, or annunciator panel) will illuminate. 2. The illuminated indicator marks align, as seen through the visual gear- position indicator in the floorboard. 3. The gear warning horn does not sound at approach power settings (see manifold pressures found in the appropriate aircraft AFM/POH). When these conditions are full- filled, the aircraft may be landed with no further attention to the landing gear system. MANUAL OPERATION - ELECTRICAL LANDING GEAR SYSTEM If the gear does not come down due to electrical mal- function, etc. the system may be operated manually as described below: 1. Pull landing gear circuit breaker OFF. 2. Put gear switch in the gear down position. 3. Push crank engage handle forward. 4. Crank clockwise approximately fifty (5) turns to low- er the gear. 5. Gear is down when green gear light is on. If a total electrical malfunction occurs, see gear visual indica- tor. -NOTE- DO NOT RETRACT GEAR IN FLIGHT WITH MANUAL HAND CRANK. ELECTRIC GEAR SYSTEM - (GARMIN G1000) The landing gear is operated by an electrical, motor driven, actuator. Travel during the extend and retract cycle is controlled by down and up limit switches lo- cated beneath the floorboard under the pilots seat. Power is supplied to actuator through a set of relays actuated by the gear selection switch. The gear selec- tion switch is located on instrument panel in front of the pilot. The actuator worm gear ball nut is connected to retract bellcrank which is connected to push- pull re- tract tubes and bellcranks throughout entire retraction system. The gear legs are constructed of welded, chrome- mo- lybdenum, tubular steel, heat treated for greater strength and wear resistance. Main gear attaching points have bushings installed in gear mounting box attached to wing spars. The steerable nose gear mounts to the cabin tubular steel frame. -NOTE- Heat treated components should NOT be re- paired; replace them. The main gear wheels have hydraulic disc brakes with a parking brake valve incorporated into system. Rubber discs in all gear leg assemblies absorb the shock of landing and taxiing. LANDING GEAR WARNING SYSTEM The landing gear warning system provides pilot with a gear warning “Voice alert” “Check Gear” that landing gear is not down and locked when throttle is retarded and landing gear is still up. 1) landing gear condition lights, GREEN for “GEAR DOWN” and RED for “GEAR UNSAFE”, and 2) VOICE ALERT, activated when landing gear is not down- and- locked and throttle is approximately 1/4 inch from idle position. The green light shows continu- ously when landing gear is fully extended. The red light shows when ever landing gear is in transit or not locked down but is OFF when landing gear is fully retracted. A visual gear- position indicator, located on floorboard, aft of the fuel selector, shows that landing gear is down when indicator marks align. The gear down light is dimmed when navigation lights are turned on. The warning system is activated when throttle is re- tarded approximately 1/4 inch from idle position. When landing gear is down and locked, the electrical circuit is opened and the alert is stopped. This warning switch is mounted on engine throttle housing and can be adjust- ed for the proper setting by loosening screw and repo- MOONEY INTERNATIONAL SERVICE BULLETIN 165 Al Mooney Road North Kerrville, Texas 78028 SERVICE BULLETIN M20-344 Date: November 28, 2022 CORPORATION THIS BULLETIN DOES NOT CHANGE AIRCRAFT TYPE DESIGN MOONEY INTERNATIONAL CORPORATION - 165 Al Mooney Road North, Kerrville, Texas 78028 tel: 830-896-6000 www.mooney.com Page 7 of 7 sitioning switch (Refer to the Garmin G1000 Cockpit Reference Guide for description). Keep the gear and exposed gear retraction system components free of mud and ice to prevent retraction interference and binding. It is recommended that re- traction/extension cycles (5 minimum) be done any time any tire is replaced to assure that no interference exists during the cycle. -CAUTION- After any landing, other than a smooth touchdown and rollout, when aircraft is above 3200 Lbs (1,452 Kg), the aircraft should undergo the Gear System Opera- tional Inspection as outlined in M20V Ser- vice and Maintenance Manual, Chapter 32. The gear warning “Voice Alert” may be checked in flight by retarding throttle with the gear up. The gear warning “Voice Alert should sound when throttle is positioned 1/4 to 3/8 inch from idle (while gear is up). MANUAL OPERATION - ELECTRICAL LANDING GEAR SYSTEM If the gear does not come down due to electrical mal- function, etc. the system may be operated manually as described below: 1. Pull landing gear circuit breaker OFF. 2. Put gear switch in the gear down position. 3. Latch forward/Lever Back to engage manual exten- sion mechanism. 4. Slowly pull “T” handle 1 to 2 inches to rotate clutch mechanism and allow to engage drive shaft. 5. Pull T- handle approximately 12 to 20 times to lower the gear. 6. Gear is down when green gear light is on. If a total electrical malfunction occurs, see gear visual indica- tor. -CAUTION- Continuing to pull on T- Handle, after GEAR DOWN light ILLUMINATES, may bind actua- tor; electrical retraction MAY NOT be pos- sible until binding is eliminated by ground maintenance. Return lever to normal posi- tion and secure with latch. Reset landing gear actuator circuit breaker. -WARNING- Do not operate landing gear electrically with manual extension system engaged. Do not fly aircraft until maintenance/inspection is done on landing gear system.