Maintenance View — Crew Reportables, Borescope, Post-Overtemperature Maintenance, Chapter Close
This article closes the chapter (and the operations tier): from the pilot's view of engine maintenance — what must be reported, what mechanical-health signals the pilot can see, and how post-overtemperature / post-stall maintenance is split. Note on method: maintenance procedure detail lives in the AMM; the pilot view covers only what the crew should report + the maintenance touchpoint types.
1. Pilot-visible maintenance touchpoints
| Touchpoint | Signal | Source article |
|---|---|---|
| Stall | must be reported for maintenance | 22 |
| EGT overtemperature | post-overtemperature maintenance (no surge / with surge) | 23 + AMM-71 |
| Vibration overlimit | VIB excessive | 24 |
| Oil metal chips | master chip detector | 05 |
| Filter clog | OIL/FUEL FILTER CLOG | 04/05/26 |
2. Crew reportables
Engine stalls must be reported for maintenance action.
Per PRO-ABN-ENG, stalls, overtemperatures, overlimit vibration and similar anomalies → log in the Tech Log and report to maintenance.
3. Post-overtemperature maintenance
Ref. 71-00-00-200-805-A The Procedure After Engine Overtemperature (No Surge or Stall); Ref. 71-00-00-200-806-A The Procedure After Engine Overtemperature with Related Surge or Stall.
Per AMM 71-00-00, post-overtemperature maintenance splits in two: (1) after overtemperature with no surge or stall; (2) after overtemperature with a related surge or stall. After an EGT overtemperature (23), maintenance follows a different procedure depending on whether a surge/stall accompanied it — so the crew's report must make clear "with or without surge."
4. Borescope and mechanical-health signals
...examine the compressor and turbine rotor blades, the internal walls of the combusti[on chamber]...
Per AMM 72-00-00, a borescope examines the compressor and turbine rotor blades and the combustion-chamber internal walls. The early mechanical-health signals (pilot/maintenance): chip detector (oil metal chips, 05) → bearing/gear wear; OIL/FUEL FILTER CLOG (04/05) → contamination/wear; VIB excessive (24) → blade/imbalance → triggering checks like a borescope.
5. The 36-article chapter review
| Tier | Articles | Core |
|---|---|---|
| A foundation (00–05) | overview / three-spool / FADEC / thrust / fuel / oil | three-spool + FADEC full-authority frame |
| B components (06–12) | ignition / start / bleed / reverse / indicating / EIU / fire | components + ENG FIRE 8 actions |
| C panorama (13–15) | interface map / SD pages / panel | cross-chapter interfaces + controls |
| D warnings (16–17) | warning overview / CTL SYS FAULT | ECAM index |
| E faults (18–31) | start / tailpipe fire / failure / relight / stall / EGT / vibration / oil / fuel / nacelle / FOD / reverser / overspeed / all-engines | 14 fault articles (the heart) |
| F operations (32–35) | ETOPS / MEL / day-in-the-life / maintenance | operations & dispatch |
[!note]- The chapter's sourcing discipline All 36 articles: Trent 700 only, zero cross-type comparison, every sentence traced to the master library, integrative reasoning labelled, operator data removed. Several debts paid off across the chapter: the EIVMU full name (deferred in 02/11, resolved in 24 from AMM-77); the oil-pressure warning threshold (deferred in 05, resolved in 25 — 25 PSI vs 535 PSI vs 0–250 PSI, three layers); and the three shaft red lines (N1 99 % / N2 103.3 % / N3 100 %) confirmed against LIM-ENG (10/30).
This completes the ATA 70 powerplant teaching set.
Self-test
[!note]- Q1. What engine situations must be reported to maintenance? Stalls (must be reported), overtemperatures, overlimit vibration, etc.
[!note]- Q2. How is post-EGT-overtemperature maintenance split? AMM-71 splits no surge/stall vs with related surge/stall — the report must state whether a surge accompanied it.
[!note]- Q3. What early mechanical-health signals can the pilot see? Chip detector (metal chips, 05), OIL/FUEL FILTER CLOG (04/05), VIB excessive (24).
Key takeaways
| Point | Detail |
|---|---|
| Reportables | stall (must report) / overtemperature / vibration → Tech Log + maintenance |
| Post-overtemperature | split no surge vs with surge (AMM-71) — report must state |
| Health signals | chip / filter clog / VIB → borescope |
| Chapter close | 36 articles: Trent 700 only, every sentence sourced, operator data removed, debts paid |
References
- FCOM PRO-ABN-ENG (22) — stalls must be reported for maintenance.
- AMM 71-00-00 — post-overtemperature maintenance split (no surge/stall vs with related surge/stall).
- AMM 72-00-00 — borescope examines compressor/turbine blades and combustion-chamber walls.
- Articles 05/24/04/26 — chip detector / VIB / filter clog (mechanical-health signals).
Independent study material, not an Airbus publication and not endorsed by the manufacturer. Always defer to the current operator FCOM, FCTM, and QRH for operational use.