AD 74-23-06

74-23-06 MCDONNELL DOUGLAS: Amendment 39-2005 as amended by Amendment 39-2999 is further amended by Amendment 39-3031. Applies to McDonnell Douglas DC-8 series airplanes, certificated in all categories, incorporating Pratt and Whitney JT3D engines.

Within 24 hours after receipt of this telegram, incorporate the operating limitations and procedures, set forth in paragraphs (1), (2), and (3), below, into the Douglas DC-8 FAA approved Airplane Flight Manual. Make appropriate notations on the log of pages. Operators shall promptly implement these limitations and procedures.

(1) Revise Section I, Limitations, to include a new item relative to fuel management.

FUEL BOOST AND/OR FEED PUMP OPERATION

Prior to descent, except during landing, the main tank pumps must be in the boost and feed position.

(2) Revise Section I, Limitations, to include a new item relative to engine operation at idle power.

FLIGHT IDLE OPERATION

Inflight at altitudes above 6,000 feet MSL and at indicated airspeeds below 200 knots, a minimum N2 engine rotor speed of 62 percent must be maintained except during landing.

(3) Revise Section II, Emergency Procedures, to include a new item relative to recovery from a condition where an engine(s) fail to accelerate in flight after the throttle levers are advanced from the idle settings:

ENGINE RESPONSE TO THROTTLE LEVER(S)

If the engine(s) fail to accelerate in flight after the throttle lever(s) are advanced, the following procedure should be used after it has been determined that a flameout has not occurred. This procedure need not be continued and affected systems may be reactivated if engine operation has been restored to normal.

PHASE I - II

Throttle Lever(s) affected engine(s) Advance Engine Anti-Ice Off Airspeed Increase (as practicable)

PHASE III

Ignition Override/Both Main Tank Pumps Boost and Feed Pneumatic Bleed (Affected Engine(s)) Reduce Electrical Load Remove Non-required

Note: One reservoir feed pump may be inoperative provided:

(a) The affected reservoir feed pump is placarded inoperative at the feed pump switch position.

(b) Established maintenance procedures for this item are followed.

(c) Sufficient fuel is carried in the associated tank to provide a minimum of 2000 pounds of additional fuel in excess of the fuel (including reserves) needed for the flight.

(d) 'FUEL LOADING AND MANAGEMENT' is in accordance with the FAA Approved Airplane Flight Manual.

Amendment 39-2005 became effective November 14, 1974, for all persons except those to whom it was made effective immediately by telegram dated October 11, 1974.

Amendment 39-2999 became effective August 10, 1977.

This amendment 39-3031 becomes effective September 15, 1977.