# JASC 6520: Tail Rotor Gearbox

- Type: JASC system/component code (FAA)
- ATA chapter: 65 Tail Rotor Drive
- Title in the code table: TAIL ROTOR GEARBOX
- Service difficulty reports: 865
- FAA code table: https://www.faa.gov/sites/faa.gov/files/JASC_Code.pdf#page=59
- Page: https://openairdocs.org/jasc/6520

## What it covers

The gearboxes which transmit engine power to the tail rotor. Includes intermediate gearboxes. Typical parts are case, seal, box, gear, spider gear, gearbox cowling and fairing, etc.

## Latest service difficulty reports

- [SDR QMLA2026090620062](https://openairdocs.org/sdr/QMLA2026090620062), Sep 4, 2026: GEARBOX, MAKING METAL (N507AM)
- [SDR QR9R2026071600001](https://openairdocs.org/sdr/QR9R2026071600001), Jul 16, 2026: CHIP DETECTOR, FAULTED
- [SDR QMLA2026060120033](https://openairdocs.org/sdr/QMLA2026060120033), May 30, 2026: CHIP DETECTOR, CONTAMINATED (N947MD)
- [SDR HEEA202603170001](https://openairdocs.org/sdr/HEEA202603170001), Mar 16, 2026: GEARBOX, INDICATION (N675P)
- [SDR QR9R2025100200001](https://openairdocs.org/sdr/QR9R2025100200001), Oct 2, 2025: GEARBOX, MAKING METAL
- [SDR GVNA202505280002](https://openairdocs.org/sdr/GVNA202505280002), May 22, 2025: GEARBOX, NO DISCREPANCY (N457JD)
- [SDR 2025F00133](https://openairdocs.org/sdr/2025F00133), May 22, 2025: GEARBOX, NO DISCREPANCY (N457JD)
- [SDR 6BMA202505150001](https://openairdocs.org/sdr/6BMA202505150001), May 13, 2025: GEARBOX, WARNING LIGHT (N145NE)
- [SDR QMLA2025032720042](https://openairdocs.org/sdr/QMLA2025032720042), Mar 25, 2025: CHIP DETECTOR, CONTAMINATED (N901NM)
- [SDR M3XA20240731010](https://openairdocs.org/sdr/M3XA20240731010), Jul 30, 2024: GEARBOX, MAKING METAL (N301MF)
- [SDR 2024FA0000270](https://openairdocs.org/sdr/2024FA0000270), Mar 28, 2024: NUT, LOOSE
- [SDR QMLA2023101920093](https://openairdocs.org/sdr/QMLA2023101920093), Oct 16, 2023: CHIP DETECTOR, UNKNOWN (N11UQ)
- [SDR QMLA2023102120097](https://openairdocs.org/sdr/QMLA2023102120097), Oct 14, 2023: GEARBOX, UNKNOWN (N222SH)
- [SDR QMLA2023081920065](https://openairdocs.org/sdr/QMLA2023081920065), Aug 19, 2023: GEARBOX, UNKNOWN (N372AM)
- [SDR YV3R2023063000573](https://openairdocs.org/sdr/YV3R2023063000573), May 15, 2023: GEARBOX, DEFECTIVE
- [SDR 2022FA0000660](https://openairdocs.org/sdr/2022FA0000660), Oct 28, 2022: GEARBOX, MAKING METAL (N140SF)
- [SDR YV3R2022052600530](https://openairdocs.org/sdr/YV3R2022052600530), May 17, 2022: NONE, DEFECTIVE
- [SDR YV3R2022052600528](https://openairdocs.org/sdr/YV3R2022052600528), Apr 9, 2022: NONE, DEFECTIVE
- [SDR YV3R2020052600528](https://openairdocs.org/sdr/YV3R2020052600528), Apr 9, 2022: NONE, DEFECTIVE
- [SDR QMLA2021110220058](https://openairdocs.org/sdr/QMLA2021110220058), Oct 29, 2021: GEARBOX, NONE (N145TJ)
- [SDR QMLA2021110120057](https://openairdocs.org/sdr/QMLA2021110120057), Oct 29, 2021: GEARBOX, NONE (N145T)
- [SDR YV3R2021090700493](https://openairdocs.org/sdr/YV3R2021090700493), Aug 19, 2021: GEARBOX, LEAKING
- [SDR AC2A2021051713902](https://openairdocs.org/sdr/AC2A2021051713902), May 15, 2021: CLAMP, WORN (N139FW)
- [SDR AC2A2021051713901](https://openairdocs.org/sdr/AC2A2021051713901), May 15, 2021: ADAPTER, WORN (N139FW)
- [SDR QMLA2020123020070](https://openairdocs.org/sdr/QMLA2020123020070), Dec 29, 2020: CHIP DETECTOR, CONTAMINATED (N409GA)
- [SDR QR9R20201215001](https://openairdocs.org/sdr/QR9R20201215001), Dec 15, 2020: SCREW, SHEARED
- [SDR QR9R20201211001](https://openairdocs.org/sdr/QR9R20201211001), Dec 11, 2020: SCREW, BROKEN
- [SDR YV3R2020120200397](https://openairdocs.org/sdr/YV3R2020120200397), Nov 12, 2020: GEARBOX, DEFECTIVE
- [SDR YV3R2020112500394](https://openairdocs.org/sdr/YV3R2020112500394), Nov 11, 2020: GEARBOX, MAKING METAL
- [SDR QMLA2020092520048](https://openairdocs.org/sdr/QMLA2020092520048), Sep 24, 2020: GEARBOX, MAKING METAL (N530H)
- [SDR 2020FA0000360](https://openairdocs.org/sdr/2020FA0000360), Aug 5, 2020: GEAR, SHEARED (N405AT)
- [SDR YV3R2020060300281](https://openairdocs.org/sdr/YV3R2020060300281), May 27, 2020: SEAL, LEAKING (N4876J)
- [SDR AC2A2020041013901](https://openairdocs.org/sdr/AC2A2020041013901), Apr 10, 2020: INTERMED GEARBOX, WORN (N639GG)
- [SDR AC2A2020020713901](https://openairdocs.org/sdr/AC2A2020020713901), Feb 7, 2020: CHIP DETECTOR, UNBONDED (N639MM)
- [SDR CA190726010](https://openairdocs.org/sdr/CA190726010), Jul 22, 2019: INDICATOR, MALFUNCTIONED
- [SDR 7AJA2019040200001](https://openairdocs.org/sdr/7AJA2019040200001), Mar 29, 2019: GEARBOX, WARNING LIGHT (N892GT)
- [SDR CA190312016](https://openairdocs.org/sdr/CA190312016), Mar 11, 2019: BEARING, MAKING METAL
- [SDR 8HBR20190211021](https://openairdocs.org/sdr/8HBR20190211021), Feb 10, 2019: SEAL, DAMAGED (N508AD)
- [SDR QMLA2018120768130](https://openairdocs.org/sdr/QMLA2018120768130), Dec 6, 2018: GEARBOX, CHIPPED (N135CH)
- [SDR QMLA2018081318094](https://openairdocs.org/sdr/QMLA2018081318094), Aug 11, 2018: PINION GEAR, WORN (N150AM)
- [SDR QMLA2018072418088](https://openairdocs.org/sdr/QMLA2018072418088), Jul 22, 2018: GEARBOX, MAKING METAL (N145SU)
- [SDR CA180706011](https://openairdocs.org/sdr/CA180706011), Jul 3, 2018: GEARBOX, LOOSE
- [SDR QMLA2018052118061](https://openairdocs.org/sdr/QMLA2018052118061), May 21, 2018: CASE, DAMAGED (N511SL)
- [SDR QMLA2018022718023](https://openairdocs.org/sdr/QMLA2018022718023), Feb 26, 2018: GEARBOX, CRACKED (N270SL)
- [SDR 2018FA0000096](https://openairdocs.org/sdr/2018FA0000096), Sep 7, 2017: BUSHING, BACKED OUT (N614HH)
- [SDR 2018FA0000094](https://openairdocs.org/sdr/2018FA0000094), Aug 25, 2017: BUSHING, BACKED OUT (N519FF)
- [SDR JYDR20170817227](https://openairdocs.org/sdr/JYDR20170817227), Aug 15, 2017: GEARBOX, OVERSERVICED (N176AC)
- [SDR 2018FA0000095](https://openairdocs.org/sdr/2018FA0000095), Aug 10, 2017: BUSHING, BACKED OUT (N614HH)
- [SDR 2018FA0000092](https://openairdocs.org/sdr/2018FA0000092), Jul 11, 2017: BUSHING, BACKED OUT (N519FF)
- [SDR QMLA2017070317063](https://openairdocs.org/sdr/QMLA2017070317063), Jul 3, 2017: WARNING LIGHT, FALSE ACTIVATION (N578AM)

---
From OpenAirDocs.org, an independent open copy of FAA data. Only the Federal Register edition on govinfo.gov is the official legal text of an AD.