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Multi - engine SER VICE
BULLETIN MEB - 57 - 01 TITLE WINGS - ACCESS P ANEL INST ALLA TION FOR FOR W ARD SP AR
EFFECTIVITY MODEL SERIAL
NUMBERS 401 401 - 0001 thru 401 - 0322 401A 401A0001 thru 401A0132 401B 401B0001 thru 401B0221 402 402 - 0001 thru 402 - 0322 402A 402A0001 thru 402A0129 402B 402B0001 thru 402B1384 41 1 41 1 - 0001 thru 41 1 - 0250 41 1A 41 1 - 0251 thru 41 1 - 0300 414 414 - 0001 thru 414 - 0965 421 421 - 0001 thru 421 - 0200 421A 421A0001 thru 421A0158 421B 421B0001 thru 421B0970 REASON Customers have requested an access panel to gain easy access to the forward spar for inspections.
DESCRIPTION This service document provides parts and instructions to trim the lower skin and install an access panel on the wings.
COMPLIANCE OPTIONAL.
This service document can be accomplished at the discretion of the owner .
A service document published by T extron A viation may be recorded as completed in an aircraft log only when the following requirements are satisfied:
1) The mechanic must complete all of the instructions in the service document , including the intent therein.
2) The mechanic must correctly use and install all applicable parts supplied with the service document kit.
Only with written authorization from T extron A viation can substitute parts or rebuilt parts be used to replace new parts.
3) The mechanic or airplane owner must use the technical data in the service document only as approved and published.
4) The mechanic or airplane owner must apply the information in the service document only to aircraft serial numbers identified in the Effectivity section of the document.
5) The mechanic or airplane owner must use maintenance practices that are identified as acceptable standard practices in the aviation industry and governmental regulations.
MEB - 57 - 01 December 20 , 2017 Page 1 of 7 T extron A viation Customer Service , P .O.
Box 7706 , Wichita , KS 67277 , U.S.A.
1 - 316 - 517 - 5800 This document contains technical data and is subject to U.S.
export regulations.
This information has been exported from the United States in accordance with export administration regulations.
Diversion contrary to U.S.
law is prohibited.
ECCN:
9E991
COPYRIGHT © 2017
MEB - 57 - 01 Page 2 December 20 , 2017 Multi - engine SER VICE
BULLETIN MEB - 57 - 01 No individual or corporate organization other than T extron A viation is authorized to make or apply any changes to a T extron A viation - issued service document or flight manual supplement without prior written consent from T extron A viation.
T extron A viation is not responsible for the quality of maintenance performed to comply with this document , unless the maintenance is accomplished at a T extron A viation - owned Service Center .
APPROV AL T extron A viation received F AA approval for the technical data in this publication that changes the airplane type design.
FLIGHT CREW OPERA TIONS No Changes
CONSUMABLE MA TERIAL Y ou must use the consumable materials that follow , or their equivalent , to complete this service document.
NAME NUMBER MANUF
ACTURER USE Color Chemical Film U074093 T extron A viation Parts Distribution 7121 Southwest Boulevard Wichita , KS 67215 T o protect bare material for final finish.
Corrosion Resistant Primer K000574 T extron A viation Parts Distribution Final finish for aluminum.
T OOLING No specialized tooling is required to complete this service document.
WEIGHT AND
BALANCE
INFORMA TION Negligible
REFERENCES Cessna Model 401 and 402 (1967 - 1978) Service Manual Cessna Model 41 1 / 41 1A (1965 - 1968) Service Manual Cessna Model 414 / 414A (1970 - 1985) Service Manual Cessna Model 421 , 421A , 421B Series (1968 - 1975) Service Manual NOTE:
T o make sure all publications used are complete and current.
Refer to www .txtavsupport.com.
PUBLICA TIONS
AFFECTED None
ACCOMPLISHMENT
INSTRUCTIONS
1.
Prepare the airplane for maintenance.
A.
Make sure that the airplane is electrically grounded.
B.
Make sure that all switches are in the OFF / NORM position.
C.
Disconnect electrical power from the airplane.
(1) Disconnect the airplane battery .
(2) Disconnect external electrical power .
D.
Attach maintenance warning tags to the battery and external power receptacle that have "DO NOT
CONNECT
ELECTRICAL POWER -
MAINTENANCE IN PROGRESS" written on them.
Multi - engine SER VICE
BULLETIN MEB - 57 - 01
2.
(If 5292032 - 4 Panels are not purchased.)
(Refer to Figure 1 , Detail B.)
Fabricate the access panels.
A.
Cut out two
7.31 inch by
3.92 inch rectangles from the S3806 - 1 1 Sheet Material or ALCLAD 2024 - T3.
B.
Radius the corners
0.25 inch.
C.
Identify one surface on each of the panels as UP .
D.
Roll or crimp the outer
0.25 inch of the panel upward 6° around the perimeter .
E.
Protect the fabricated panels with U074093 Color Chemical Film and K000574 Corrosion Resistant Primer .
3.
(Refer to Figure 1 , Detail A.)
Make the cutout in the lower right wing skin.
NOTE:
The cutout dimension is identified in Figure 1 Detail A.
A.
Identify the area to cut the lower wing skin between the engine and fuselage inboard of the 501 1 141 Rib.
B.
Put the 5292032 - 4 (or fabricated) Access Panel into position and trace the outline on the lower wing skin.
C.
Remove the rivets that are inside the traced panel outline.
D.
Insert a piece of scrap stainless steel between the lower wing skin and the lower forward spar cap.
W ARNING:
Do not damage the forward spar when making the cutout in the lower wing skin.
Any damage to the forward spar will likely required spar , spar cap , or spar fitting replacement.
Premature cracking may occur if damage to the spar , spar cap , or spar fitting is not noticed.
Mechanics should use great care and caution when making this cutout.
Every effort must be made to protect the spar , spar cap , and spar fitting from damage.
E.
Make the cutout in the lower wing skin at the identified area.
F .
Deburr the cutout.
G.
Remove the scrap stainless steel.
H.
Protect the edges of the cutout with U074093 Color Chemical Film and K000574 Corrosion Resistant Primer .
4.
(Refer to Figure 1 , Detail A.)
Install the nutplates on the right wing.
A.
Hold the lower wing skin in position with temporary sheetmetal fasteners.
B.
Identify the locations of the nutplates from the existing
0.159 inch - diameter holes.
C.
Make 10 of the
0.159 inch - diameter holes larger to
0.162 inch - diameter holes at the identified locations through the lower wing skin and forward spar angles.
D.
Identify eight hole locations for the NAS1097AD5 - 6 Rivets.
E.
Countersink eight existing
0.159 inch - diameter hole locations 100° x
0.246 inch - diameter .
F .
Identify two
0.162 inch - diameter hole locations for the MS21072L06K Nutplates.
G.
Match drill four Number 40
(0.098 inch - diameter) holes in the lower wing skin and forward spar angles that align with the holes in the MS21072L06K Nutplates.
H.
Identify eight
0.162 inch - diameter hole locations for the MS21069L06K Nutplates.
I.
Match drill 16 Number 40
(0.098 inch - diameter) holes in the lower wing skin and forward spar angles that align with the holes in the MS21069L06K Nutplates.
J.
Countersink 20 Number 40
(0.098 inch - diameter) holes 100° x
0.179 inch - diameter .
K.
Put an identifying mark by the hole that will have the CR2672 - 3 - 02 Rivet installed.
MEB - 57 - 01 December 20 , 2017 Page 3
MEB - 57 - 01 Page 4 December 20 , 2017 Multi - engine SER VICE
BULLETIN MEB - 57 - 01 L.
Install two MS21072L06K Nutplates with four MS20426AD3 - 5A Rivets.
M.
Install eight MS21069L06K Nutplates with 16 MS20426AD3 - 5A Rivets and one CR2672 - 3 - 02 Rivet.
N.
Install eight NAS1097AD5 - 6 Rivets through the lower wing skin and forward spar angles.
5.
Install the access panel on the right wing.
A.
Put the 5292032 - 4 or fabricated Access Panel into position and identify the hole locations.
NOTE:
Make sure that the crimped surface of the panel contacts the lower wing skin.
B.
Match drill 10 Number 27
(0.144 inch - diameter) holes in the 5292032 - 4 or fabricated Access Panel that align with the nutplates.
C.
Deburr the drilled holes.
D.
Protect the 5292032 - 4 (or fabricated) Access Panel with U074093 Color Chemical Film and K000574 Corrosion Resistant Primer .
E.
Paint the 5292032 - 4 (or fabricated) Access Panel the same color as the lower surface of the wing.
F .
Install the 5292032 - 4 (or fabricated) Access Panel with 10 MS35206 - 230 Screws.
6.
Do this modification again for the left wing.
7.
Remove the maintenance warning tags and connect the airplane battery .
8.
Make an entry in the airplane logbook that states compliance and method of compliance with this service document.
Beechcraft Hawker Multi-engine SERVICE BULLETIN Cessna TEXTRON ÀVIATION MEB-57-01 B21721 5011141 Rib (Reference) NAS1097AD5-6 MS21072L06K (8 Required) Rivet (1 Required) CR2672-3-02 Rivet (2 Required) Nutplate 5292032-4 Between Center Cutout
0.25 Radius Access Panel Forward (Typical) - 6.31 (1 Required) Spar Angles
0.69
1.92 L Forward · - _1.19= • Spar Angles (Reference) Lower Forward- Spar Fitting Drill Holes (Reference) Number 40 MS21069L06K In Skin
(0.098 Inch Diameter) Nutplate And Angles MS35206-230 Hole to Match Nutplate (8 Required) To 0.162 Inch Screw (20 Required) Diameter (10 Required) MS20426AD3-5A Rivet (19 Required) FWD
• OUTBD
DETAIL A Looking Up at Forward Spar (Right Side Shown, Left Side Opposite) NOTE: Model 402 shown for illustrative purposes.
Other models are similar.
NOTE 1: All dimensions are shown in inches.
A5292T032 Figure 1. Access Panel Installation For Forward Spar (Sheet 1) MEB-57-01 December 20, 2017 Page 5
Beechcraft Hawker Multi-engine SERVICE BULLETIN Cessna
TEXTRON AVIATION MEB-57-01 B21722
- 7.31 0.25-Inch Radius Corners ЛА
3.92 Crimp edge upward 6-degrees by 0.125-inch
DETAIL B Number 27 5292032-4 Access Panel (0.144 inch-diameter) Hole Fabricate from S3806-11 (10 Required)
(0.050-Inch Alclad 2024-T3) Match-drill to align with the installed nutplates Crimp edge upward 6-degrees by 0.125-inch
VIEW A-A B529T3021 AA529T3021 Figure 1. Access Panel Installation For Forward Spar (Sheet 2) MEB-57-01 Page 6 December 20, 2017
Multi - engine SER VICE
BULLETIN MEB - 57 - 01 MA TERIAL
INFORMA TION Order the kit / parts below to install this modification.
NEW P / N QUAN- TITY KEY WORD OLD P / N
INSTRUCTIONS /
DISPOSITION MEB - 57 - 01 1 Kit , consisting of the following parts:
MS21072L06K 4 Nutplate None CR2672 - 3 - 02 2 Rivet None NAS1097AD5 - 6 16 Rivet MS20470AD5 - 6A Discard MS35206 - 230 20 Screw None MS20426AD3 - 5A 38 Rivet None MS21069L06K 16 Nutplate None MEB - 57 - 01 1 Instructions The part that follows is required to complete this modification.
NEW P / N QUAN- TITY KEY WORD OLD P / N
INSTRUCTIONS /
DISPOSITION 5292032 - 4 2 Access Panel None Access panel If 5292032 - 4 Access Panels are not available , the part that follows can be used to fabricate two 5292032 - 4 Access Panels.
NEW P / N QUAN- TITY KEY WORD OLD P / N
INSTRUCTIONS /
DISPOSITION S3806 - 1 1 1 Sheet Material None Optional to fabricate access panels * Please contact a T extron A viation Authorized Service Facility for current cost and availability of parts listed in this service document.
MEB - 57 - 01 December 20 , 2017 Page 7
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Multi - engine OWNER
ADVISOR Y MEB - 57 - 01 TITLE WINGS - ACCESS P ANEL INST ALLA TION FOR FOR W ARD SP AR T O:
Cessna Model 401 , 401A , 401B , 402 , 402A , 402B , 41 1 , 41 1A , 414 , 421 , 421A , and 421B Aircraft Owner REASON Customers have requested an access panel to gain easy access to the forward spar for inspections.
COMPLIANCE OPTIONAL.
This service document can be accomplished at the discretion of the owner .
MA TERIAL A V
AILABILITY P ART NUMBER A V
AILABILITY COST MEB - 57 - 01 * * S3806 - 1 1 * * 5292032 - 4 * * * Please contact a T extron A viation Authorized Service Facility for current cost and availability of parts listed in this service document.
W
ARRANTY None NOTE:
As a convenience , service documents are now available online to all our customers through a simple , free - of - charge registration process.
If you would like to sign up , please visit the Customer Access link at www .txtavsupport.com to register .
MEB - 57 - 01 December 20 , 2017 Page 1 of 1 T extron A viation Customer Service , P .O.
Box 7706 , Wichita , KS 67277 , U.S.A.
1 - 316 - 517 - 5800 This document contains technical data and is subject to U.S.
export regulations.
This information has been exported from the United States in accordance with export administration regulations.
Diversion contrary to U.S.
law is prohibited.
ECCN:
9E991
COPYRIGHT © 2017
No text on this page: it may be a figure. Open the PDF to see it.