Using the Early ETOPS Test of § 33.201 to Demonstrate IMI Compliance. 2.1.7
2.1.7.1 General.
Section 33.90(b) allows you to use an approved test conducted per § 33.201, in lieu of a separate IMI test. Use of the Early ETOPs test allows you to demonstrate compliance with both regulations through a single test on one engine.
If you use this method, the following conditions apply:
1. After you complete the full number of test cycles required for an IMI test performed per § 33.90(a), you must interrupt the § 33.201 test to conduct a complete on-wing (or other) inspection. Note the following:
a. The inspection must be acceptable to us, the FAA, in order to demonstrate compliance with § 33.90 requirements.
b. An acceptable on-wing inspection must include, but is not limited to, the inspections and tests listed in paragraph 2.1.7.2 of this AC.
2. Prior to EIS, you must complete the § 33.201 test in its entirety. This will provide further evidence that no undiscovered engine fault exists during the IMI portion of the test.
3. If the IMI inspection is completed and the TC is issued, you must complete the remaining portion of the § 33.201 test in order to comply with § 33.90(b) requirements.
4. FAA review of the general pass/fail criteria defined in paragraph 2.1.5 of this AC must demonstrate that the engine is fully serviceable per the ICAs, unless otherwise accepted by us.
2.1.7.2 On-Wing Inspection.
2.1.7.2.1 Borescope Inspection.
Full borescope-inspect all accessible gas path stages or areas of the fan, compressor, combustor, and turbine modules, to the serviceable limits of the ICAs.
2.1.7.2.2 System Fault and Status Message Interrogation.
Evaluate all system fault and status messages, for electronic-controlequipped engines. Include both current and previously recorded messages, to the serviceable limits of the ICAs.
2.1.7.2.3 Oil System Chip Detector and Filter Inspection.
Inspect all oil system chip detectors and filters for contaminants.
2.1.7.2.4 Fuel System Filter Inspection.
Inspect all fuel system filters for contaminants.
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2.1.7.2.5 Main Engine Oil Sample Test.
Test the engine oil (for example, spectrographic analysis) for contaminants that might indicate impending internal failure.
2.1.7.2.6 Visual Inspection.
Perform a complete visual inspection of the inlet, exhaust, and externals, to the serviceable limits of the ICAs. The engine must be serviceable.
2.1.7.2.7 Power Calibration.
Demonstrate that the engine can produce rated power or thrust at a sea-level, hot-day corner point condition within approved limits.
Fixed Engine Overhaul Period. 2.2 You may recommend a fixed overhaul period as the equivalent of an IMI , if you do not intend to cover the engine with a structured inspection program. If you use this approach, you should:
• Conduct the engine test under § 33.90 in a similar manner to that described in paragraph 1.7 of this AC.
• Determine if the test results support the desired fixed overhaul period.
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Appendix A APPENDIX A. ADVISORY CIRCULAR FEEDBACK FORM If you find an error in this document, or have recommendations to improve it or to add new subjects, you may complete this form and submit it as follows:
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