SDR IPXA2024103046577

Service difficulty report · Actuator · Boeing 7478F

Difficulty date: October 30, 2024
Submitted: October 30, 2024
Operation: Air carrier
Aircraft: N634UP
Make and model: Boeing 7478F
Aircraft serial: 37564
Aircraft time: 30,334 hours, 4,533 cycles
System (JASC): 2720 · Rudder Control System
Part: Actuator
Part number: 6013K000101
Part serial: 18083961
Condition: Faulted
Location: Zone 300
Stage of operation: CR
How discovered: O
Nature of condition: J
Precautionary procedure: A

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

AIR TURN BACK, RUDDER RATIO SINGLE EICAS MESSAGE. RESULTED IN ATB. REMOVED AND REPLACED UPPER RUUDER RATIO CHANGER ACTUATOR SERVO M520 IAW AMM 27-21-12, OPS CHECK GOOD MSG CLEARED. RIG PIN R4 REMOVED. C/W RII REQUIREMENTS, VERIFIED RIG PIN R4 REMOVED, REF GMM 04-02

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