---
kind: "section"
citation: "14 C.F.R. § 33.64"
title: "14"
number: "33.64"
heading: "Pressurized engine static parts."
url: "https://uscodex.org/cfr/14/33.64"
---

# §33.64. Pressurized engine static parts.

- (a) **Strength.** The applicant must establish by test, validated analysis, or a combination of both, that all static parts subject to significant gas or liquid pressure loads for a stabilized period of one minute will not:
  - (1) Exhibit permanent distortion beyond serviceable limits or exhibit leakage that could create a hazardous condition when subjected to the greater of the following pressures:
    - (i) 1.1 times the maximum working pressure;
    - (ii) 1.33 times the normal working pressure; or
    - (iii) 35 kPa (5 p.s.i.) above the normal working pressure.
  - (2) **Exhibit fracture or burst when subjected to the greater of the following pressures—**
    - (i) 1.15 times the maximum possible pressure;
    - (ii) 1.5 times the maximum working pressure; or
    - (iii) 35 kPa (5 p.s.i.) above the maximum possible pressure.
- (b) Compliance with this section must take into account:
  - (1) The operating temperature of the part;
  - (2) Any other significant static loads in addition to pressure loads;
  - (3) Minimum properties representative of both the material and the processes used in the construction of the part; and
  - (4) **Any adverse geometry conditions allowed by the type design.**

## Notes

### Amendments

[Amdt. 33-27; 73 FR 55437, Sept. 25, 2008; Amdt. 33-27, 73 FR 57235, Oct. 2, 2008]

### Authority

Authority: 49 U.S.C. 106(g), 40113, 44701, 44702, 44704.

### Source

Source: Docket No. 3025, 29 FR 7453, June 10, 1964, unless otherwise noted.

### Amendments

[Amdt. 33-27; 73 FR 55437, Sept. 25, 2008; Amdt. 33-27, 73 FR 57235, Oct. 2, 2008]