FLUSHHEAD RIVETS SPECIFIED RIVET OVERSIZED REPLACEMENT RIVET
STANDARD  DIA.  1/64" OVERSIZE  DIA.  1/32" OVERSIZE  DIA. 
MS20426-AD3 MS20426-AD4 MS20426-AD5  3/32 1/8 5/32  NAS1241-AD3 NAS1241-AD4 NAS1241-AD5  7/64 9/64 11/64  MS20426-AD4 MS20426-AD5 MS20426-AD6  1/8 5/32 3/16 

CHART 804
1/64" OVERSIZE RIVET HOLE STANDARDS

RIVET DIAMETER  HOLEDIAMETER  DRILL SIZE 
7/64 9/64 11/64  .133 .144 .177  #33 #27 #16 
NOTE: 

For NAS1241, NAS1242, CR3242 and CR3243 Rivets.
EFFECTIVITY: 040-999

PAGE2 51-40-00
Jan10/90
PIPER AIRCRAFT
PA-42-720 (Advanced Tralner)
MAINTENANCEMANUAL

C. RivetSubstitution
1. Blind Rivets
Blind rivets can be substituted for AD type solid aluminum rivets, except in the following areas:
1.
Wing,fin, or stabilizer spar assemblies.

2.
Machined fittings.

3.
Castings.

4.
Forgings.

5.
Wingor tail surface attachment fittings.

6.
Control surface hinges.

7.
Landinggear fittings or other highly stressed components.

2.
Hollow Rivets

Hollow rivets can be substituted for solid rivets in nut-plate attachment only if their sole purpose is the attachment of nut plates. Hollow rivets may not be substituted for solid rivets if the nut plate to be attached is 1/4" or larger. Hollow rivets will not be substituted for solid rivets if the attachment will become a leak through a barrier. (Example: Firewalls, pressure bulkheads, fuselage skins, etc.)

3.
High-ShearFasteners

When "huck-bolts" (53 LP-DT) have been removed for repairs, they can be replaced by hi-locks (HL18 or HL19). For oversize holes, use HL62 or HL63.
EFFECTIVITY:
040-999 Jan10/90
PIPER AIRCRAFT
PA-42-720(Advanced Trainer)
MAINTENANCEMANUAL

C. RivetSubstitution(continued)
CHART805 (Sheet 1of 4)
STRUCTURALRIVET SUBSTITUTION

SOLID THINNESTMATERIAL1 SUBSTITUTEBLINDRIVET4
RIVET
DIA. .016 .020 .025 .032 .040 .051 .064 PROTRUDING FLIJSH
to .125 HEAD HEAD
incl.

1/8" Two Two Two Two See See See NAS1398D NAS1399D
TYPE 1/8" 1/8" 1/8" 1/8" Note Note Note (Cherrylock (Cherrylock
AD Rivets Rivets Rivets Rivets 6 6 6 CR2163) CR2162)
See See See See Note11 Note 8 Note 8 Note 8
Two Two Two Two NAS1738B NAS1739B
1/8" 1/8" 1/8" 1/8" 1/8" 1/8" 1/8" (Bulbed (Bulbed
Rivets Rivets Rivets Rivets See See Cherrylock Cherrylock See See Notes Note CR 2249) CR 2248) Note Note 7 and 9 9
88
5/32" Two Two Two Two Two See See NAS1398D NAS1399D TYPE 5/32" 5/32" 5/32" 5/32" 5/32" Note Note (Cherrylock (Cherrylock AD Rivets Rivets Rivets Rivets Rivets 7 7 CR 2163) CR 2162)
See See See See See Note 11 Note 8 Note 8 Note 8 Note8
Two Two Two Two Two See NAS1738B NAS1739B
5/32" 5/32" 5/32" 5/32" 5/32" Notes 5/32" (Bulbed (Bulbed
Rivets Rivets Rivets Rivets Rivets 7 and Cherrylock Cherrylock
See See See See 10 CR2249) CR 2248) Note Note Note Note 888 10
1.
Thematerial thickness refers to the thinnest gauge of material that the fastener has to pass through.

2.
Wheretwo rivets are called for, replace each solid aluminum rivet with two blind rivets of the same diameter as the solid rivet.

3.
Whena row of four or more rivets is involved and two rivets are called for, then the total number of rivetsrequired is twice the original number of solid rivets in the row less one.

4.
Substituterivets are to be placed at the location of the original solid rivet maintainingedgedistances and spacing shown in Chart 801.

5.
When two blind rivets are to be substitutedfor one solid rivet, place the second rivet between two adjacent rivets, maintaining edgedistancesand spacing as specified in Chart 801.

6.
If countersunk, usetwo 1/8 in. rivets.

7.
If countersunk, use two 5/32 in. rivets.

8.
Do not countersink.

9.
If dimpled, use two 1/8 in. rivets.

10.
If dimpled, use two 5/32 in. rivets for material thickness up to .070. For thickness over .070, use one 5/32 in. rivet.

11.
Do not use if material is to be dimpled.

EFFECTIVITY:

Jan10/9051-40-00
PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCE MANUAL

C. Rivet Substitution (continued)
CHART 805 (Sheet 2 of 4) STRUCTURALRIVETSUBSTITUTION
APPROVED SUBSTITUTIONS FOR MS20470AD 1/8 INCH PROTRUDING HEAD TYPE RIVET ON A DIRECT "ONE FOR ONE" BASIS.
　
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