| AAR Circ.# |
Date: |
Cross
Ref. |
Rule
And Comments |
| C-6033 |
05-76 |
TB-17 |
Mandatory production of NFL bearings only. Permissible
6-1-76 and mandatory 12-1-76. O'rings became part
of the assembly. |
| C-7052 |
04-85 |
TB-17 |
Mandatory remanufacture of vintage cones, effective
5-1-85. See RBM Page H-II-23, rule 3.22. |
| C-7256 |
01-88 |
TWBL
25 |
CLARIFICATION: Locking plate marks required
to be stamped or etched. Marks must include "N" or "R" for
new or reman. bearings and month and year of manufacture
or reconditioning. |
| C-7269 |
05-88 |
TWBL
23-A |
Prohibited the use of cap screw seal rings in
new and reconditioned bearings. |
| C-7286 |
06-88 |
TWBL
23-A |
Mandatory use of cap screw thread gage in reconditioning
shops. |
| C-7329 |
11-88 |
TWBL
23-A |
Procedure for the removal and re-application
of end caps. |
| C-7365 |
03-89 |
TL-46 |
Tighter cone bore specifications in reconditioned
bearings. Maximum tolerance reduced by 0.0005" for
all interchangeable sizes. |
| C-7366 |
03-89 |
TWBL
23-A |
Proposed requirements for use of lubricated
SAE Grade 5 Bearing Car Screws (request for comments).
Proposed effective date 6-1-89. |
| C-7384 |
05-89 |
|
Mandatory lubrication of second-hand cap screws. |
| C-7404 |
07-89 |
TWBL
23-A |
Mandatory lubrication of all new cap screws.
Rescinds the requirements for use of Grade 2 Cap
Screws issued in C-7366. Reinstates SAE Grade 2
Cap Screws as the industry standard. |
| C-7440 |
11-89 |
TWBL
23-A |
Effective 3-1-90 all Grade 2 Cap Screws must
be certified minimum proof load of 45,000 pounds. |
| C-7475 |
11-90 |
|
Locking Plate Stenciling. |
| DV-2174 |
11-90 |
C-7487 |
Mandatory use of new bearings on new cars, effective
1/91. |
| C-7478 |
05-90 |
TWBL
12 |
Mandatory use of dial snap gages for sizing
all journals. |
| C-7479 |
04-90 |
TWBL
23-A |
All newly ordered cap screws must be Grade 2
effective 6-1-90. |
| C-7490 |
05-90 |
|
Accelerated phase-out of plain bearings. All
cars to be equipped with journal roller bearings
be January 1, 1994 (if in interchange service). |
| C-7513 |
05-90 |
GC-1788 |
Elimination of converted friction bearing side
frames on interchange freight cars. |
| C-7526 |
10-90 |
TWBL
18-E |
Restricted use of second-hand roller bearings.
All journal roller bearings on wheel sets applied
to cars must be new or reconditioned. The transfer
of wheelsets within a repair facility among cars
of the same ownership is permissible. |
| C-7569 |
10-90 |
AC-1661 |
New bearings required on new cars; new or reconditioned
on rule 88 cars.Effective 1-1-91. |
| DV
2176 |
11-90 |
|
AAR Mechanical Division Circular. |
| C-7606 |
01-91 |
TWBL
23-A |
Cap screw re-torque and seal ring removal procedures.
Procedures for the accelerated removal of cap screw
seal rings from roller bearings. |
| C-7616 |
02-91 |
DV
2174 |
Prohibition of converted friction bearing sideframes. |
| C-7622 |
02-91 |
WTBL
23-A |
Amendment to Circular Letter C-7606 to provide
for cap screw lubrication. |
| C-7643 |
04-91 |
TWBL
23-A |
Revised second-hand journal dimensions. Maximum
tolerance increased by 0.0005" for all sizes. |
| C-7672 |
05-91 |
TWBL
23-A |
Journal plating specifications. Plated journals
to have same dimension as new journals. |
| C-7713 |
9-91 |
|
Accelerated Phaseout of Straight-Plate Wheels |
| C-7716 |
09-91 |
TWBL
18-A |
Implementation of Special Letter Ballot Proposal
Circular No. D.V. 2192: Accelerated Phase-out of
Straight Plate Wheels. |
| C-7730 |
01-92 |
TWBL
-25 |
Revision in number and size of repaired spalls
on component raceways. The number of repaired spalls
allowable reduced by half from previous specifications. |
| C-7732 |
01-92 |
TWBL
-24 |
Revised cone bore plating specifications. All
cone bores will be plated to new cone specifications
(dimensions). |
| C-7751 |
03-92 |
TB-
10-B |
Reduction in permissible cone back face wear.
A limit of 0.010" backface wear was specified. |
| C-7752 |
12-91 |
TWBL
-22 |
Revision to secondhand axle journal diameter
tolerances. |
| C-7772 |
12-91 |
|
Prohibition of Vent Fittings in Roller Bearing
Backing Rings |
| C-7793 |
01-92 |
TB-48 |
Elimination of vents in backing rings effective
1-1-92: Reconditioned bearings effective 3-1-92. |
| C-7911 |
12-92 |
CC201
S92 |
Recommended practice of applying new bearings
to cars dedicated to 286,000 lb. service. |
| C-8103 |
11-93 |
AC 1928 |
Accelerated phaseout of straight plate wheels
on cars capable of carrying hazardous material
in interchange. |
| C-8113 |
11-93 |
TWBL
23-A |
Mandatory removal of O'rings from bearings in
service, effective January 1, 1994. |
| C-8150 |
3-94 |
TWBL
23-A |
Locking plate marking requirements to be able
to identify bearings which have had O'rings removed.
Rule 1K17, 1K18, 1K21, and Fig. 4.57. |
| C-8171 |
4-29-94 |
TWBL
23 |
Revised rule 1A8 requiring magnetic particle
testing of new axle journals before remounting.
Mandatory 1-1-95. |
| C-8186 |
5-10-94 |
AC-
1946 |
Prohibition of Valdunes Creusot-Loiere non-heat-treat
straight-plate 36 inch wheels marked "F" or "FW" manufactured
in 1980 and 1981. Remove on sight, effective July
1, 1994. |
| C-8223 |
6-20-94 |
TWBL
24 |
Reduced maximum Roller Bearing mounted lateral
to 0.015". Reduced maximum allowable cone
face wear (backface) to 0.005". Both effective
1-1-95. |
| C-8287 |
11-21-94 |
|
Implementation of AAR Standard S-259 For Freight
Cars With 286,000 lb. Gross Rail Load |
| C-8295 |
12-20-94 |
TWBL
24 |
Premium Roller Bearing Conditioning Standards |
| C-8302 |
1-20-95 |
TWBL |
Revision to Circular Letter C-8295 (Premium
Roller Bearing Conditioning Standards) |
| C-8340 |
4-21-95 |
EW-136,
137, & 138 |
EARLY WARNING- DEFECTIVE HYATT 6-B ROLLER BEARINGS. |
| C-8376 |
7-20-95 |
TWBL
23.1 |
Rescind Requirements to Magnetic Particle Test
New Axle. |
| C-8379 |
7-20-95 |
TWBL
24.2 |
Implementation of changes to G-II and H-II allowed
by C-8302 |
| C-8410 |
9-95 |
|
Defective Hyatt Certificate No. 6B Roller Bearings |
| C-8422 |
10-95 |
|
Inner Ring Replacement |
| C-8525 |
4-96 |
|
Implementation of Modification of Section G
II, Figure 4.43 |
| C-8526 |
4-96 |
|
Implementation of Modification of Specification
M-967 Section G II, Rules 1 and 2 |
| C-8665 |
11-96 |
|
Refinishing Requirements for Inner Rings with
Backface Wear |
| C-8675 |
12-96 |
|
Repair Procedures for Axles with Seal Wear Ring
Grooves |
| C-8751 |
8-97 |
|
Section G, Part II, End Cap Application Requirements |
| C-8761 |
9-97 |
|
Prohibition of Cap Screw Seal Wear Rings |
| C-8790 |
11-97 |
|
Revision to Field Manual Rule 26.E.4.h |
| C-8837 |
1-98 |
|
Waiver of New Back-to-Back Rules |
| C-8864 |
3-24-98 |
|
Removal/UT Inspection of Edgewater & Mafersa
Wheels Manufactured 1994-95 |
| C-8895 |
6-98 |
|
Revision to Field Manual Rule 88 and 90...Cap
Screw Seal Rings |
| C-8933 |
10-98 |
|
Implementation of Changes to Section G II, Rules
1A8 and 1A11 |
| C-8944 |
11-98 |
|
Editorial Revision to Field Manual Rule 26 |
| C-8961 |
12-98 |
|
Removal/UT Inspection of Mafersa Wheels |
| C-9094 |
1-16-00 |
|
Interchange Prohibition of Roller Bearing Cap
Screw Seal Rings |
| C-9100 |
2-8-00 |
TWBL-23.23 |
Implementation of Revisions
to Section G Part II Rules 1K21 and 1K21 Paragraph
2 |
| C-9103 |
2-8-00 |
TWBL-24.9 |
Implementation of Revision to Section H, Standard
S-710 (Locking Plates) |
| C-9174 |
6-28-00 |
|
Revision and Clarification of MSRP, Section
G, Part II, Wheel and Axle Manual, Rule 1K21 |
| C-9193 |
8-17-00 |
TW-24.7 |
Implementation of Revisions
to Section G, Part II, Rule 1K17 |
| C-9203 |
9-8-00 |
ADR-10042 |
Revision to Rule 36 Correct
Repair Chart -- Group B |
| C-9283 |
2-21-01 |
TWBL-25.8 |
Implementation of Revisions
to Section H, Part II, Rule 3.19 |
| C-9284 |
2-21-01 |
TWBL-22.24 |
Implementation of Revisions
to Section G, Part II, Rule 1K4 |
| |
4-25-01 |
TB-24.42 |
Letter granting unconditional
approval of Mobilith SHC 221 Grease |
| |
4-27-01 |
TB-6.28 |
Letter granting unconditional
approval of Brenco's Generation 2000 roller bearing |
| |
4-27-01 |
TB-10E |
Letter granting an additional
4,000 car-set allotment of Thin Gap Seals |
| C-9366 |
10-29-01 |
Ac-2199 |
Revision to Field Manual Rule
41.E.24 |
| C-9388 |
12-3-01 |
EW-5183 |
Inspection & Removal of
Out-of-Gage Wheelsets |
| C-9394 |
12-6-01 |
AC-2237 |
Revision of Field Manual Rule
43 |
| C-9440 |
4-3-02 |
CRB-1250 |
Wheel Set Job Codes Updated
Effective April 1, 2002 |
| C-9551 |
11-21-02 |
CC-170.7.1 |
Implementation of New AAR
Standard S-286 Specification for 286,000# GRL
Cars for Unrestricted Interchange Service |
| C-9556 |
10-10-02 |
AC-2283 |
Ultrasonic Testing of Wheels
in Service |
| C-9566 |
12-17-02 |
AC-2236 |
Deletion of Rule 26 from the
Field Manual |