What was found
DURING HEAVY MAINTENANCE: LANDING GEAR - RH MAIN GEAR - INTRODUCE DOUBLE LOCKING SIDESTAY CARDAN JOINTS; REF: /1/ AIRBUS SERVICE BULLETIN A320-32-1429 REVISION 02, DATED JULY 11, 2017 /2/ FAA AD 2017-18-21 WITH EFFECTIVITY DATE OF AUGUST 9, 2017 /3/ MESSIER BUGATTI - DOWTY SB 200-32-315 (A320 FLEET) /4/ MESSIER BUGATTI - DOWTY SB 201-32-63 (A321 FLEET) /5/ AMOC AIR-676-18-021 DATED OCT 23, 2017. THIS EC PROVIDES INSTRUCTION FOR THE COMPLIANCE OF REF: /1/ FOR ALL AFFECTED MAIN LANDING GEAR (MLG) ON A320 & A321 FLEET. BACKGROUND: AFTER FURTHER EVALUATION OF CURRENT MAIN LANDING GEAR (MLG) DESIGN, IT HAS BEEN CONCLUDED THAT THE UPPER AND LOWER CARDAN JOINTS OF THE MLG SIDE STAY FIN 2505GM AND FIN 2506GM REQUIRE MODIFICATION. THE CARDAN JOINTS ARE CURRENTLY LOCKED USING A TABBED WASHER WHICH GIVES A SINGLE LOCKING ONLY. THIS EC COMPRISES WITH TWO CONFIGURATION TASK CARDS (A320 & A321). ACCOMPLISHMENT OF THIS EC WILL IMPROVE THE LOCKING OF THE MLG UPPER AND LOWER SIDE STAY CARDAN PINS AND MINIMIZE THE RISK OF MAINTENANCE ERROR. NOTE: 1. TC A320-32-1429-CONFIG-001-LH IS EFFECTIVE FROM N503JB TO N834JB, 2. TC A320-32-1429-CONFIG-001-RH IS EFFECTIVE FROM N503JB TO N834JB, 3. TC A320-32-1429-CONFIG-003-LH IS EFFECTIVE FROM N903JB TO N946JL, 4. TC A320-32-1429-CONFIG-003-RH IS EFFECTIVE FROM N903JB TO N946JL, 5. THIS TASK IS CONSIDERED MAJOR, REFER TO ISSUED FAA AD 2017-18-21 WITH EFFECTIVE DATE OF AUGUST 9, 2017, 6. ALL AFFECTED PART NUMBERS REMAIN THE SAME. NOTE: THE ORIGINAL EC A320-32-1429 HAS BEEN SPLIT INTO TWO AND COMPLIANCE RECORDS ARE CARRIED OVER THE FOLLOWING ECS: A. EC A320-32-1429-01 IS CREATED TO TRACK AGAINST LH MLG ONLY. B. EC A320-32-1429-02 IS CREATED TO TRACK AGAINST RH MLG ONLY. (E/C: A320-32-1429-02)