Regarding the large nose gear bearings, is there any data available for them, for purposes of Owner Produced parts?
BAC search strings: nose gear bushing, nose bushing, nose bearing, brass bearing, bronze bearing, big bearing, pivot bearing, pivot bushing, bearing stock, bearing material, bronze stock, brass stock, bushing stock, bushing material, 169-810016.
Technical Editor:
Here is the data on the nose gear main pivot bushings, basic part number 169-810016. The data is off of part of an old original Beech drawing for the bearings, and out of a Federal Procurement List material specification that is referenced on the Beech drawing (QQ-B-671 Class 3).
These large bushings were made by Beech in a number of different sizes, with the intent that they could then be re-fabricated to size to meet the needs of field repairs. I have seven different part numbers, at least four of which are not even in the original drawings. Most of the replacement sizes were not listed in the IPC, and are no longer available. And in fact, my experience has been that all of those different-size bushings have wound up being sold under the primary part number. The result being that you have no clue what dimensions you will actually wind up with, if you order one of these bushings by part number (no matter who it comes from; RAPID or elsewhere). I have therefore only listed maximum dimensions for ODs and minimum dimensions for IDs.
Minimum bearing ID = 3.498″, maximum bearing ID = 3.507″
Minimum bearing-section OD = 3.625″, maximum OD = 3.645″
Flange OD = 4.250″
Flange thickness = .150″. However, a laminated shim is used that comes in a .045″ thickness. It would be a reasonable fabrication, with better workmanship, to make the flange thickness to a dimension that avoids the need to add a shim.
Inside radius at the bearing-flange junction = .250″ to .270″ as needed to mate with the steel bearing.
Material specifications:
Family ALUMINUM BRONZE
DIN CDA C95400
ASTM1 B505,,
ASARCON
SAE1 B505,,
AMS
FEDERAL1 QQC390 G5,QQ-B-671, CLASS 3
INGOT # 415
OTHER DESG. ALUMINUM BRONZE 9C
MILITARY1 MIL-B-16033, CLASS 3,