Reboring of the RIB4 Fittings

TASK 54-51-17-300-003-A
Reboring of the RIB4 Fittings

ZONE: 400

1. Reason for the Job
This procedure is applicable to the fitting bores that you found damaged or with incorrect dimensions after removal of the bushes.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
98D54003015000	1	R I RING AT RIB 4/5

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.08BAA9)	Non Aqueous Cleaner-General - -
(Material No.14SBA1)	Textile-Lint free Cotton -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
400	POWER PLANT, NACELLES AND PYLONS

D. Referenced Information

REFERENCE	DESIGNATION
Installation of the Boring Bar ** ON A/C NOT FOR ALL
Installation of the Boring Bar ** ON A/C NOT FOR ALL
Installation of the Boring Bar ** ON A/C NOT FOR ALL
Reboring of the Fitting ** ON A/C NOT FOR ALL
Reboring of the Fitting ** ON A/C NOT FOR ALL
Reboring of the Fitting ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 54-51-17-320-052-A ** ON A/C NOT FOR ALL

A. Repair Size Diameter
(1) Table of the repair size diameter

REPAIR SIZE DIAMETER	NOMINAL VALUE MM (in.)	TOLERANCE mm (in.)
R1	44.2 (1.7401)	+ 0.03 (+ 0.00118)
		+ 0 (+ 0)
R2	44.4 (1.7480)	+ 0.03 (+ 0.00118)
		+ 0 (+ 0)
R3	44.6 (1.7559)	+ 0.03 (+ 0.00118)
		+ 0

4. Procedure

NOTE: This procedure is the same for the left and the right pylon.

NOTE: The procedure that follows is given for one side and is the same for the other side.

Subtask 54-51-17-420-081-A ** ON A/C NOT FOR ALL

A. Installation for Fitting Reboring of the Bell which is part of the Tool 98D54003015000 R I RING AT RIB 4/5 (98D54003015000)

Installation of the Boring Bar ** ON A/C NOT FOR ALL

(1) Install the centering pins (51) and (52) and expand them until they touch the fitting bores.
(2) Put the boring bar (53) into the fittings and the centering pins (51) and (52).
(3) Put the bell (50) in the accurate position.
(4) Attach the bell (50) with the 3 "C" presses (54).
(5) Make sure that the boring bar (53) turns freely.
(6) Remove the boring bar (53).
(7) Remove the centering pin (51).

Subtask 54-51-17-320-053-A ** ON A/C NOT FOR ALL

B. Reboring of the Pylon Fittings with the Tool 98D54003015000 R I RING AT RIB 4/5 (98D54003015000)

Reboring of the Fitting ** ON A/C NOT FOR ALL

(1) Install the borer (55):
(a) Make sure that the borer (55) is retracted.
(b) Hold the borer (55) between the two fittings.
(c) Put the boring bar (53) into the fittings, the centering pin (52), the borer (55) and the bell (50).
(d) Install the pin (56) in the boring bar (53).
(2) Rebore the fittings to get the minimum applicable repair diameter. If necessary, do the reboring procedure that follows again until you get the correct diameter value.

NOTE: The boring thickness is 0.02 +0.00 mm or +0.02 mm (0.0008 +0.0000 in. or +0.0008 in.).

(a) Expand the borer (55) with the adjustment nut (57).
(b) Lock the blades of the borer (55) with the locking nut (58).
(c) Turn the boring bar (53) slowly and push it lightly with a tap wrench to rebore the four holes.

NOTE: You must always turn the boring bar (53) in the same direction to prevent damage to the borer (55) and to the fittings.

(d) Turn the boring bar (53) while you pull it to move back the borer (55) between the two fittings.

NOTE: You must continue to turn the boring bar (53) in the same direction (as for the reboring) to prevent damage to the borer (55) and to the fittings.

Subtask 54-51-17-020-081-A ** ON A/C NOT FOR ALL

C. Removal of the Bell which is Part of the Tool 98D54003015000 R I RING AT RIB 4/5 (98D54003015000)

Reboring of the Fitting ** ON A/C NOT FOR ALL

(1) Remove the pin (56) from the boring bar (53).
(2) Remove the boring bar (53) and the borer (55) from the fittings.
(3) Remove the centering pin (52).
(4) Remove the 3 "C" presses (54) and the bell (50).
(5) Make sure that the rebored diameter is in the correct condition and that the diameter value is in the correct tolerance.

5. Close-up
Subtask 54-51-17-110-053-A ** ON A/C NOT FOR ALL

A. Cleaning of the Fitting
(1) Clean the fitting with Non Aqueous Cleaner-General - - (Material No.08BAA9) and a lint-free cotton cloth Textile-Lint free Cotton - (Material No.14SBA1) .

[Rev.10 from 2021] 2026.04.01 02:00:58 UTC