FAA SPECIAL AIRWORTHINESS
Aviation Safety INFORMATION BULLETIN
SAIB: NM-18-18
SUBJ: Equipment/Furnishings – First Observer’s Seat Cup Holder Date: July 2, 2018
This is information only. Recommendations aren’t mandatory.
Introduction
This Special Airworthiness Information Bulletin is to advise registered owners and operators of The
Boeing Company Model 737-600, -700, -700C, -800, -900, and -900ER series airplanes, and
Model 737-8 airplanes, with line numbers 1 through 6,640 inclusive, of the potential for the cup
holder of the First Observer’s seat to be inadvertently removed.
At this time, the airworthiness concern is not an unsafe condition that would warrant airworthiness
directive (AD) action under Title 14 of the Code of Federal Regulations (14 CFR) part 39.
Background
An operator informed us about a cup holder which stuck to a cup and was inadvertently discarded
with the cup. This created an open hole, exposing the P6-11 circuit breaker panel just below the cup
holder (see Figure 1). The P6-11 circuit breaker panel contains some of the airplane's primary
electrical power circuit breakers. Spilling liquid or dropping something metal into the open hole
could result in a short circuit of primary electrical power systems during flight.
Boeing has issued Service Bulletins 737-25-1790 (for Model 737-600, -700, -700C, -800, -900, and
-900ER series airplanes), and 737-25-1791 (for Model 737-8 airplanes). This service information
provides procedures to secure the cup holder by adding adhesive film to the bottom of the cup holder
flange. This improves the retention force to prevent unintended removal of the cup holder.
Recommendations
The FAA recommends that all owners and operators of the affected airplanes improve the safety of
their aircraft by incorporating the instructions in the applicable service information at the earliest
opportunity. The design change was incorporated in production on airplanes manufactured after line
number 6,640, so those airplanes are not affected.
For Further Information Contact
Susan L. Monroe, Aerospace Engineer, Cabin Safety and Environmental Systems Branch, AIR-785,
FAA, Seattle ACO Branch, 2200 South 216th Street, Des Moines, WA 98198; phone and fax: 206-
231-3570; email:
[email protected].
For Related Service Information Contact
The Boeing Company, P.O. Box 3707, Seattle, Washington 98124; telephone: (425) 342-6176;
fax: (425) 342-7826.
1
© Copyright The Boeing Company; used with permission.
Figure 1 – First Observer’s Seat
2
Please find attached a Foreign State of Design Advisory document, endorsed by EASA.
This advisory document is also online at https://ad.easa.europa.eu/ad/NM-18-18 .
Should you have any questions, please contact the Agency by e-mail at
[email protected] or by fax,
No.: +49 221 89990 9515.
Safety Information Section Email:
[email protected]
EASA Website
(Attachment is in Acrobat PDF format)
Postal: Postfach 10 12 53, 50452 Cologne, Germany
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