Web Access: http://mtsc.usps.gov/pdf/mmo/2005/mmo08605.pdf
This Maintenance Management Order (MMO) provides information on new PSIN O910A
(clockwise rotation) and O910B (counter-clockwise rotation) locks used in centralized delivery
and collection equipment.
A new generation of centralized delivery and collection equipment is either now available to the
field or in process for near term release. Critical to the overall security success of both the new
and older generations of delivery equipment are the newly redesigned 0910A & O910B locks.
These new, security enhanced locks are INCLUDED with new Cluster Box Units (CBU),
Outdoor Parcel Lockers (OPL), and certain Indoor Parcel Lockers (IPL).
When ordering O910A and O910B spares from Topeka Material Distribution Center (TMDC),
only new type locks will be shipped. These locks have USPS-L1172C impressed on the front.
See Figure 4. They will mount in older generation CBU, Neighborhood Delivery Collection Box
Units (NDCBU), OPL and IPL equipment only by using a special adhesive washer shown in
Figure 6. The original (older generation) O910 lock will not fit in new equipment.
The attachment includes detailed information on the new O910A and O910B locks, pictures of
both original and new type locks, with differences clearly shown. In addition, instructions for
installation in most older generation equipment are included.
Direct any questions or comments concerning this bulletin to the HelpDesk, Maintenance
Technical Support Center, P.O. Box 1600, Norman OK 73070-1600; telephone FTS 2000 (405)
573-2123 or toll free (800) 366-4123.
Earl J. Jones
Maintenance Technical Support Center
Maintenance Policies and Programs
Attachment: PSIN 0910 Detailed Information and Installation Instructions