AD 70-25-03

AD Final Rules - DRS_70-25-03.html
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AD Number:
70-25-03
Document Type:
AD Final Rules
Docket Number:
Unknown
Subject Heading:
BOEING Model 747 Series Airplanes
Subject:
Thrust Reversal System
Status:
Current
Citation:
This information is not available.
Citation Publish Date:
Effective Date:
01/29/1971
Make:
The Boeing Company
Model:
747-100 Series | 747-100B Series | 747-100B SUD Series | 747-200B Series | 747-200C Series | 747-200...Show more
Product Type:
Aircraft
Product Subtype:
Large Airplane
Affected AD:
Superseded AD:
Affected By:
Superseded By:
Service/Office:
Office of Primary Responsibility:
CFR Part Reference:
Part 39
Comments:
AIRWORTHINESS DIRECTIVES FINAL RULES: 70-25-03
CITATION:   This information is not available.

PAGE NUMBER:  

DOCKET NUMBER:   Unknown

AMENDMENT:   39-1149

AD NUMBER:   70-25-03

SUBJECT HEADING:   BOEING Model 747 Series Airplanes

ACTION:  

SUMMARY:  

DATES:   Effective January 29, 1971.

ADDRESSES:  

FOR FURTHER INFORMATION CONTACT:  

SUPPLEMENTARY INFORMATION:  

REGULATORY TEXT:  
70-25-03 BOEING: Boeing 747 and PRATT AND WHITNEY JT9D. Amdt. 39-1116 as amended by Amendment 39-1149. Applies to Boeing Model 747 Series Airplanes and Pratt and Whitney Aircraft Model JT9D Series Engines.

Compliance required within the next 600 hours' time in service after the effective date of this AD, unless previously accomplished.

To reduce the possibility of engine surge during thrust reversal, accomplish the following:

(a) Modify the engine Air-Automatic Deceleration System in accordance with Pratt and Whitney Aircraft Service Bulletin Number 2841, dated August 21, 1970, or later FAA approved revision or an equivalent method approved by the Chief, Engineering and Manufacturing Branch, FAA, Eastern Region.

(b) Modify the engine controls mixing box, airplane electrical wiring system, engine cowl panel, bleed duct bracket and pressure regulator vent line in accordance with the Boeing Company Service Bulletin Number 75-2002, dated September 25, 1970, or later FAA approved revision or an equivalent method approved by the Chief, Aircraft Engineering Division, FAA, Western Region.

(c) Upon completion of the work described in (a) and (b) on all four engines, reverse thrust may be used to landing roll speeds as noted in the FAA approved Boeing 747 Airplane Flight Manual Normal Operating Procedures entitled RABS PROCEDURE (OPTIONAL), or an alternate procedure approved by the Chief, Aircraft Engineering Division, FAA, Western Region.

Until such time as the modification of all four engines on an aircraft is accomplished, install the placard described in Boeing Service Bulletin Number 78-2016, dated November 10, 1970, and referenced at Paragraph C(iv), of Boeing Service Bulletin Number 75-2002, dated September 25, 1970, or later FAA approved revisions or an equivalent placard approved by the Chief, Aircraft Engineering Division, FAA, Western Region. The placard may be removed after the modifications in (a) and (b) are accomplished. The placard need not be installed if RABS PROCEDURES (OPTIONAL) is not used as an optional procedure by the operator.

Amendment 39-1116 effective January 5, 1971.

This amendment 39-1149 becomes effective January 29, 1971.

FOOTER: