# AD 84-08-05 R1: Pitot-Static Systems

- Type: Airworthiness directive
- Status: Current
- Products: Boeing 727-100 Series
- Effective: August 1, 1984
- Amendment: 39-4889
- Data sheets: TCDS A3WE
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/F20A5FD4CA559B04862568A800756DB8.0001
- Page: https://openairdocs.org/ad/84-08-05-R1

## The airworthiness directive

84-08-05 R1 BOEING: Amendment 39-4852 as amended by Amendment 39-4889. Applies to Boeing Model 727-100 airplanes modified to install a Performance Data Computer under STC SA1602NM. To preclude the loss of airspeed information due to conditions related to the pitot- static system, accomplish the following no later than November 5, 1984, unless already accomplished.

A) Connect the first and second pilots' flight instruments to the appropriate pitot-static systems to conform with Civil Air Regulations (CAR) 4b.612 using a means approved by the Manager, Seattle Aircraft Certification Office, FAA, Northwest Mountain Region.

B) Perform a leak check of the pitot-static system in accordance with Federal Aviation Regulations (FAR) Part 91.170.

C) Perform a functional test of the air data system.

D) Perform a functional check of the pitot heat system.

E) Alternate means of compliance which provide an equivalent level of safety may be used when approved by the Manager, Seattle Aircraft Certification Office, FAA, Northwest Mountain Region.

Amendment 39-4852 became effective May 7, 1984. This Amendment 39-4889 becomes effective August 1, 1984.

## Related

- Names [STC SA1602NM](https://openairdocs.org/stc/SA1602NM): Installation of a Lear Siegler performance data computer system.

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