Grid fin actuator response lag >40ms under thermal soak

Investigating

team@spacex.demo · 2026-08-12 21:16:33 · ISS-SPAX-0003

Customer

US Space Force

Americas · owner: casey.kim

Machine / asset

Merlin 1DMerlin 1D

serial M1D-RG-0207 · MACH-0003

DisciplineElectrical

PriorityMedium

Spares statusIdentified

Last updated2026-08-15 06:16

Description

Actuator response exceeds the 40ms spec under sustained 80°C thermal soak during the re-entry profile simulation. Repeatable across three runs.

Currently: In progress2 entries

CKcasey.kimIn progressAug 14 · 03:16 PM
Swapped in a spare amplifier from stores; re-running the soak profile overnight.
CKcasey.kimDiagnosedAug 13 · 03:16 AM
Lag tracks with driver board temperature, not with hydraulic pressure. Points at the servo amplifier, not the actuator.

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