Figure 4. § 33.87(c), 150-Hour Endurance Test Cycles 16-25 for Rotorcraft Engine with 30-Minute OEI Power Rating 30 Minute OEI Pow er Idle Takeoff Maxim um Continuous 5 min.
1/2 min.
4 1/2 min.
5 min.
30 min.
30 min.
A1-5 0 1 2.5 3 5.5 6 Time ~ Hours 03/09/15 AC 33.87-1A
Figure 5. § 33.87(d), 150-Hour Endurance Test Cycles 1-15 for Rotorcraft Engine with Continuous OEI Power Rating A1-6
-4 1/2 min.
1/2 min.- • Figure 6. § 33.87(d), 150-Hour Endurance Test Cycles 16-25 for Rotorcraft Engine with Continuous OEI Power Rating • 1 hr. † 11/2 21/2 31/2 Time ~ Hours
• *- 5 min.
Continuous OEI- Takeoff - Maximum - continuous Idle - A1-7
Figure 7. § 33.87(e), 150-Hour Endurance Test Cycles 1-15 for Rotorcraft Engine with Rated 2 ½ Minute OEI Power Rating A1-8
Figure 8. § 33.87(e), 150-Hour Endurance Test Cycles 16-25 for Rotorcraft Engine with Rated 2 ½ Minute OEI Power Rating *9 applications @ TO One last application in 25 cycles 1/2 min. -4 1/2 min.
Time ~ Hours
- +745 min. * * 30 min.
1 1 1/2
• la- 5 min.
2 ½ - min. OEI - Takeoff - Maximum - continuous Idle - A1-9
-4 1/2 min.
for Rotorcraft Engine with Rated 2 ½ Minute and 30-Minute OEI Power Rating 5 1/2 Figure 9. § 33.87(e), 150-Hour Endurance Test Cycles 1-25 *24 applications at 30 min. OEI One last application at 2 ½ - min. OEI 1/2 min.• 3 1/2 Time ~ Hours *-5 min. * mur 1 1 1/2
• la-5 min.
2 ½ - min. OEI - 30 Minute OEI - Takeoff - Maximum - continuous Idle - A1-10
-4 1/2 min.
Figure 10. § 33.87(e), 150-Hour Endurance Test Cycles 1-15 for Rotorcraft Engine with Rated 2 ½ Minute and Continuous OEI Power Rating 1/2 min. 5 1/2 + 1 hr. 1 11/2 21/2 31/2 Time ~ Hours → -2½ min → 4-5 min.
2 ½-min. OEI - Continuous OEI- Takeoff - - Maximum - continuous Idle - A1-11
Figure 11. § 33.87(e), 150-Hour Endurance Test Cycles 16-25 for Rotorcraft 03/09/15 Engine with Rated 2½ Minute and Continuous OEI Power Rating 2 ½-min. OEI - *-2 min *- - 5 min.* Continuous OEI - Takeoff - * 1 hr. *9 applications at Continuous OEI One last application in 25 cycles Maximum - continuous A1-12 1/2 min.→ -4 1/2 min.
Idle - * *-5 min.
1 112 21/2 31/2 5 1/2 AC 33.87-1A Time ~ Hours
Figure 12. § 33.87(f), 2-Hour Supplemental Endurance Test, Cycle 1 of 4 for Rotorcraft Engine with 30-Second and 2-Minute OEI Power Ratings A1-13 Pow er 1 min.
2 min.
30 sec.
2 min.
30 sec.
Idle Takeoff 50% Takeoff 30 Second OEI 2 Minute OEI 30-min OEI * Greatest of * Continuous OEI, or Max Continuous 30 min. 35 min.
* When the rated 30-min OEI is not the greatest, the entire 65 minute period must be run at the greatest of rated continuous OEI or maximum continuous power 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 Time ~ Minute 03/09/15 AC 33.87-1A
Figure 13. § 33.87(f), 2-Hour Supplemental Endurance Test, Cycles 2-4 for Rotorcraft Engine with 30-Second and 2-Minute OEI Power Ratings 30 Second OEI 2 Minute OEI Takeoff 50% Takeoff Idle Pow er Greatest of 30-min OEI, or Continuous OEI, or Maximum Continuous 1 min.
30 sec.
2 min.2 min.
30 sec.
5 min.
0 5 10 15 Time ~ Minute 03/09/15 AC 33.87-1A
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Appendix 2. Endurance Test Plan Requirements
1. The applicant must prepare a test plan for the endurance test that thoroughly defines the test objective, test engine, germane or primary test hardware, test facility, test procedures, and the pass or fail criteria. Submit the test plan early enough to allow us sufficient amount of time to review and approve the plan prior to the start of the test.
2. The following paragraphs describe types of information included in a test plan for the calibration test, endurance test, and teardown inspection. We intend this information as a guide to preparing the plan and is not all-inclusive or mandatory.
a. Description of the Test Objective. The applicant should list the part 33 paragraphs for which the tests are intended to show compliance. Provide a brief description of how each quoted regulation will be complied with by the test(s).
b. Test engine configuration. The applicant should identify the test engine configuration.
The configuration of the test engine must substantially conform to the final type design, however, non-type design hardware, components, and software may be used in the test engine to achieve certain test conditions when approved by us. For example, the applicant may need to modify test equipment, engine configurations, and test sequences in order to run the test at simultaneous triple redline conditions. In this case, the applicant should identify, in the test plan, the parts and components in the test engine that are non-type design. The applicant should also validate that the non-type design parts and components will not adversely affect the test outcome or the test integrity.
c. Facility test equipment. The applicant should list all facility test equipment necessary to conduct the test, configuration of slave hardware, bleed configuration, and oil system modification(s) to achieve maximum oil temperature, etc. The applicant should also identify the calibration means for the test equipment.
d. Conformity. The applicant should identify the germane hardware of the test engine in a user friendly format for easy identification. The applicant should also list the components that require pre- and post-endurance test bench calibration, and the required conformities of the test engine. Appendix 5 of this AC provides additional information on conformity inspections.
e. Test procedure. T he test procedure should provide sufficient details to describe the method of compliance. These may include:
(1) discussions of pre- and post-endurance calibration tests,
(2) test cycles or hours,
(3) test sequences if they differ from those prescribed in §§ 33.87(b) through (g),
(4) fuel, oil, and hydraulic fluid to be used and sampling intervals, A2-1
(5) oil consumption, and
(6) other component testing requirements, as applicable.
f. Post-test. Applicants should detail the inspection requirements for the engine “ dirty” and “clean” inspections done at the end of the endurance test and following the complete engine disassembly.
g. Success Criteria. Applicants should describe the pass or fail criteria that determine how engine performance characteristics, or condition of parts and components, or both, meet their regulatory requirements under §§ 33.85 and 33.93.
A2-2