AD 48-04-02

AD Final Rules - DRS_48-04-02.html
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AD Number:
48-04-02
Document Type:
AD Final Rules
Docket Number:
Unknown
Subject Heading:
Airworthiness Directives; Aeronca Model 7AC, 11BC and 11AC Airplanes
Subject:
Wing Rib Rework
Status:
Current
Citation:
This information is not available.
Citation Publish Date:
Effective Date:
Make:
American Champion Aircraft Corp.
Model:
11AC | 11BC | 7AC
Product Type:
Aircraft
Product Subtype:
Small Airplane
Affected AD:
Superseded AD:
Affected By:
Superseded By:
Service/Office:
Office of Primary Responsibility:
CFR Part Reference:
Part 39
Comments:
AIRWORTHINESS DIRECTIVES FINAL RULES: 48-04-02
CITATION:   This information is not available.

PAGE NUMBER:  

DOCKET NUMBER:   Unknown

AMENDMENT:  

AD NUMBER:   48-04-02

SUBJECT HEADING:   Airworthiness Directives; Aeronca Model 7AC, 11BC and 11AC Airplanes

ACTION:  

SUMMARY:  

DATES:  

ADDRESSES:  

FOR FURTHER INFORMATION CONTACT:  

SUPPLEMENTARY INFORMATION:  

REGULATORY TEXT:  
48-04-02 AERONCA: Applies to 7AC Serial Numbers 7AC-1 Through 7AC-7129; 11BC Serial Numbers 11BC-1 Through 11BC-173; and 11AC Serial Numbers 11AC-1 and Up.

Compliance required by March 1, 1948.

Inspect the wing leading edge for buckled nose ribs or loose PK screws by pressing leading edge skin with hand to nose ribs. If the skin can be depressed beyond the normal wing contour, other than the extreme nose radius, indicated by section A-A in Figure 1, the fabric should be cut open on the bottom surface just forward of the front spar for thorough inspection. Item No. 1 below should be accomplished on all wings whether damage has occurred or not, whereas item No. 2 pertains only to damaged ribs found in the above inspection. Repair need not be made if buckling is confined to area forward of section A-A of Figure 1.



1. To help prevent further failures of the nose ribs five additional No. 4 x 1/4 PK screws or, as an alternate, Cherry CR163-4-2 rivets or equivalent are to be installed in all nose ribs. Four PK screws or rivets are to be installed on the top surface and one PK screw or rivet is to be installed in the bottom as shown in Figure 1. Apply dope liberally under the PK screw head before tightening. It is not necessary to remove the fabric to accomplish this modification.

2. Damaged ribs should be cut away at the top and bottom of spar. The new nose ribs are installed by means of two gussets on the side of the ribs as shown in Figure 1. Factory kits, Aeronca P/N 5-185-2 and 5-190-2, are to be used.

(Aeronca Helps and Hints No. 17 with three supplements thereto covers this same subject.)

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