69-16-01\tBOEING: Amdt. 39-838. Applies to Boeing Model 727, 727C, and 727-200 Series Airplanes. \n\tCompliance required within 300 hours time in service after the effective date of this AD as indicated, unless already accomplished. \n\tTo provide the flight crew with more complete procedures to be followed if all generators are lost change the Airplane Flight Manual to read the following, or make an equivalent change approved by the Chief, Aircraft Engineering Division, FAA Western Region. \n\t(a)\tBoeing 727 series (except 727-31, -31C, and 231), Airplane Flight Manual, Emergency Procedures Section, Loss of All Generators paragraph, must be revised to read: \n\tLOSS OF ALL GENERATORS \n\tPhase I \n\tEssential power selector - STANDBY \n\tBattery Switch - Check ON \n\tPHASE II \n\tAny generator field relay - CLOSE \n\tRepeat if necessary until voltage and frequency of a generator are normal. \n\tWhen voltage and frequency are normal switch essential power selector to operating generator. \n\tNOTE: If a differential fault is indicated in any generator system, an automatic lockout feature prevents closing of the field relay. This lockout feature can be bypassed by momentarily moving the battery switch to OFF, then back ON, or by manually tripping and resetting the associated generator DC control circuit breaker. \n\tPhase III \n\tRestore system to normal if desired. \n\tNOTE: Leave generator supplying essential power isolated until system integrity is verified. \n\tRemove heavy electrical loads (galleys, air conditioning pack fans, etc.) or \n\tOpen bus tie breakers (if closed) before closing Generator Control Breakers. \n\tFor further information, see electrical systems operation, Normal Procedures - Section III. \n\t(b)\tBoeing 727 series 727-31, -31C, and 231, Airplane Flight Manual, Emergency Procedures Section, Loss of All Generators paragraph, must be revised to read: \n\tLOSS OF ALL GENERATORS \n\tPhase I \n\tEmergency Power Switch - ON \n\tBattery Switch - Check ON \n\tPhase IIAny generator field relay - CLOSE \n\tRepeat if necessary until voltage and frequency of a generator are normal. \n\tWhen voltage and frequency are normal switch essential power selector to operating generator. \n\tNOTE: If a differential fault is indicated in any generator system, an automatic lockout feature prevents closing of the field relay. This lockout feature can be bypassed by momentarily moving the battery switch to OFF, then back ON, or by manually tripping and resetting the associated generator DC control circuit breaker. \n\tPhase III \n\tRestore system to normal if desired. \n\tNOTE: Leave generator supplying essential power isolated until system integrity is verified. \n\tRemove heavy electrical loads (galleys, air conditioning pack fans, etc.) or \n\tOpen bus tie breakers (if closed) before closing Generator Control Breakers. \n\tFor further information, see electrical system operation, Normal Procedures - Section III. \n\tThe effective date of amendment 39-810 is revised to"August 15, 1969." \n\tEffective August 15, 1969. \n\tRevised September 12, 1969.