Handwritten note: inspection procedure for suspension bells recovered from a customer vehicle

In this document

This very brief handwritten sheet lists a small work procedure concerning "bells" (hydropneumatic suspension spheres) to be "recovered" from a "customer car" p. 8.

The process is noted in four successive steps:

1. Dismantling
2. Clearance check
3. Reassembly
4. Burst tests

No additional technical details (dimensions, clearance values, results) accompany these mentions: the document is limited to this work framework p. 8.

The page also features a small pencil sketch in the upper left section, representing a hatched vertical shape crossed by a horizontal line — a diagram whose exact nature is unidentifiable p. 8. At the bottom of the page are a set of initials and short annotations in blue pencil, as well as a line with numbers that could correspond to a dimension or reference, but whose precise content remains illegible p. 8.

No date appears on this sheet.

Context

"Bells" refers, in the vocabulary of the hydropneumatic suspension developed by Citroën (notably for the DS and the ID), to the spheres containing nitrogen under pressure and the fluid that provide the spring effect of the system. Their inspection after return from a customer vehicle was part of the standard warranty and technical development procedures of the time.

The "burst test" mentioned here corresponds to a mechanical resistance test intended to verify that the sphere withstands operating pressures without rupture — a standard check for this type of pressurized part, but whose precise methods are not documented in this sheet.

Archivist's perspective

This document, very succinct, seems to be an internal work note rather than a formal report: it sets a method to follow — dismantle, check, reassemble, test — without it being possible to say whether it is a personal aide-mémoire of Paul Magès or instructions intended for a technician.

Its interest lies mainly in the fact that it documents, even in a minimal way, the quality monitoring of suspension parts after customer use — an aspect complementary to calculation notes and laboratory tests. It can usefully be compared with the Magès calculation note: P55 suspension, leaf spring and 6 hydropneumatic bells, which deals with the same component from a more theoretical angle, as well as the Pressure reading of pneumatic suspension blocks, which illustrates the type of measurements that could accompany such an inspection.

The absence of a date and the elliptical nature of the notes invite caution: it is likely a simple workshop or design office memo, not an official document.