What it covers
The instruments which indicates temperature measured at reciprocating engine cylinder heads. Typical parts are indicator, case, dial, needle, thermocouple lead, sensor, and connector, etc.
Service difficulty reports · 62
Reports filed under 7721, newest first.
| 1998 | 2 |
|---|---|
| 1999 | 5 |
| 2000 | 5 |
| 2001 | 8 |
| 2003 | 1 |
| 2007 | 2 |
| 2008 | 3 |
| 2009 | 1 |
| 2011 | 3 |
| 2012 | 2 |
| 2016 | 1 |
| 2019 | 6 |
| 2020 | 1 |
| 2021 | 1 |
| 2022 | 15 |
| 2023 | 5 |
| 2024 | 1 |
SDR SWAA2024080823958Probe · failedRED BOX ON SHUTDOWN IN #2 ENG. EGT REDLINE LIMIT EXCEEDED ON TAKEOFF. DISCONNECTED A/T AND REDUCED THRUST; NO FURTHER INDICATIONS.<[01] T/S PER FIM 71-06 TASK 805 AND ACCOMPLISHED EA M-21-177-01860. FOUND CJ10 HARNESS; S3; AND S4 EGT PROBES FAILING RESISTANCE SDR 2023FA0000564Cylinder Head · crackedCRACKED #5 CYLINDER HEADSDR CALA2023072602333Thermocouple · out of rangeR ENG HAD RAPID EGT INCREASE TO CAUTION REDUCED THRUST TO 74 N1 AND STABILIZED 77-20862 AND 77-20872. UPDATED MAA CODE FIX USING VENDOR MAA SCREEN UPDATED MAA CODE FIX USING VENDOR MAA SCREEN UPDATED MAA CODE FIX USING VENDOR MAA SCREEN UPDATED MAA CODE FIX US
See all 62 reportsOther codes in chapter 77 · 13
7700Engine Indicating System7710Power Indicating System7711Engine Pressure Ratio (EPR)7712Engine BMEP/Torque Indicating7713Manifold Pressure (MP) Indicating7714Engine RPM Indicating System7720Engine Temperature Indicating System7722Engine EGT/TIT Indicating System7730Engine Ignition Analyzer System7731Engine Ignition Analyzer7732Engine Vibration Analyzer7740Engine Integrated Instrument System7797Engine Indicating System Wiring