ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL
Rev.
8
MM-1-4
Sep
20/17
(2) Reissue - Where large numbers of changes are involved, a complete reissue of the
manual is warranted. Preceding issues of the manual then become obsolete and
should be discarded.
1-5. Service Document Publications
(1) Service Directive Bulletins – Used to direct the owner/operator and/or maintenance
personnel to make mandatory changes, improvements, or inspections to the aircraft
applicable to the entire fleet or a segment of the fleet that are typically
safety/airworthiness related. The information provided in the Service Directive
Bulletins will be incorporated in the maintenance manual as needed at a later date.
At the time of incorporation, the Service Directive Bulletin is superseded by the
maintenance manual, and accomplishment or sign-off of the Service Directive
Bulletin in the maintenance records book is no longer required. A detailed entry
should be made in the maintenance records to indicate that the Service Directive
Bulletin is superseded by the maintenance manual.
(2) Service Information Letters – Used to transmit information, recommendations, and
general service instructions to the aircraft owner/operator and/or maintenance
personnel applicable to the entire fleet or a segment of the fleet. The information
provided in the Service Information Letters will be incorporated into the maintenance
manual as needed at a later date.
(3) Service Instructions – Used to provide the owner/operator and/or maintenance
personnel with information that is applicable to specific aircraft and does not meet
the criteria of a Service Information Letter or Service Directive Bulletin. Service
Instructions will not be distributed to the entire fleet.
Service Information Letters and Service Directive Bulletins incorporated into the
maintenance manual are logged in the Service Information Letter Index or the Service
Directive Bulletin Index (as appropriate) located on the Enstrom Helicopter website:
www.enstromhelicopter.com (follow the applicable link under the Tech Publications section
of the Technical Support page). Each index numerically lists all Service Information Letters
and Service Directive Bulletins, respectively, and identifies those which have been
incorporated into the maintenance manual. All Service Information Letters and Service
Directive Bulletins are also located under the Tech Publications section of the website.
Enstrom distributes maintenance manual reissues and revisions in hardcopy form via mail
to owners and operators who are registered with Enstrom. Notice of recently released
Service Information Letters and Service Directive Bulletins is provided via a postcard
mailing. Registration to receive publication mailings can be coordinated through Enstrom
Product Support.
UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED
Visit www.enstromhelicopter.com for instructions to order an original manual and to register for email notification of updates.
