# SDR CALA2026041315324

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 4, 2026
- Submitted: April 13, 2026
- Operation: Air carrier
- Aircraft: [N68805](https://openairdocs.org/aircraft/N68805), registered now
- Make and model: Boeing 737924ER
- Aircraft serial: 42818
- Aircraft time: 37,749 hours, 13,795 cycles
- System (JASC): [2700 · Flight Control System](https://openairdocs.org/jasc/2700)
- Part: Unknown
- Condition: Oscillates
- Stage of operation: CL
- How discovered: O
- Nature of condition: F
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2026041315324

## Discrepancy

SMALL PITCH OCCILATIONS DURING CLIMBOUT. PRONOUN CED BELOW FL210 . NOT FEL T THROUGH FLT CONTROLS FLT CREW STATES AIRCRAFT PORPOISING OCCURRED THROUGH ALL PHASES OF FLIGHT WITH NO AUTOPILOT ENGAGED, BUT WAS MOST NOTICEABLE IN CLIMB CONFIGURATION AND BECAME MORE STABLE PAST FL210. NO MOVEMENT OF FLIGHT CONTROLS OR STABILIZER TRIM WHEEL NOTICED DURING OSCILLATION. PORPOISING ALSO OCCURS ON DESCENT WITH A/P ENGAGED AND BECAME MORE PREVALENT AT FL160. REF FIM 22-16 TASK 801 PERFORMED AUTOPILOT ELEVATOR ACTUATOR LINKAGE INSPECTION, AND ELEVATOR RIGGING TEST REF AMM TASK 22-11-00-820-802 G(1)(B) ELEVATOR RIGGING CHECK. NO FAULTS. CONTINUE T.S.  AFTER COMPLETION OF CURRENT ELEVATOR RIGGING TEST, RECOMMEND RUNNING BOTH ELEVATOR AND HORIZONTAL STABILIZER THROUGH FULL TRAVEL AND INSPECT ALL LINKAGES AND CONTROL ARMS FOR EXCESSIVE WEAR OR PLAY. ALSO REF AMM TASKS IN TRM 2700-02119, STARTING WITH PART 3 DUE TO INITIAL REPORT OF GRIPE ON CLIMBOUT, FOR HORIZONTAL STABILIZER AND JACKSCREW INSPECTIONS. REF LP 8437822 FOR RECENT REPORT OF SEVERE TURBULENCE 2-LEGS PRIOR.  COMLETED ELEVATOR RIGGING TEST REF AMM 22-11-00-820-802. SINGLE AND DUAL AUTHORITY TESTS PASSED NO DEFECTS NOTED. FURTHER T/S REQUIRED. PERFORMED ELEVATOR OUTPUT TORQUE TUBE BUSS LINKAGE FREEPLAY - CHECK IN REF WITH AMM 27-31-32-200-804 FOUND RIGHT SIDE WITH 0.37" OF FREEPLAY AND THE LEFT WITH 0.31" OF PLAY. LOCKING LOG PAGE

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