Compound Stressor Gaps in eVTOL Propulsion Battery Qualification
EASA MOC VTOL.2440 requires trigger method, SOC, internal-short position, and heating rate to be characterized as interacting variables — the strongest compound stressor mandate any regulator has published for propulsion batteries. The FAA has no public equivalent. This card maps four consequential stressor combinations the eVTOL mission presents against what each jurisdiction governs and what the DVP must define itself. All four are program-owned in at least one jurisdiction, and two — aging severity and mission-duty conditioning before initiation — are program-owned in both.
Compound Stressor Gaps in eVTOL Propulsion Battery Qualification
EASA MOC VTOL.2440 requires trigger method, SOC, internal-short position, and heating rate to be characterized as interacting variables — the strongest compound stressor mandate any regulator has published for propulsion batteries. The FAA has no public equivalent. This card maps four consequential stressor combinations the eVTOL mission presents against what each jurisdiction governs and what the DVP must define itself. All four are program-owned in at least one jurisdiction, and two — aging severity and mission-duty conditioning before initiation — are program-owned in both.
Non-Governing Technical Evidence
Quantifying the key parameters of thermal runaway in aviation lithium-ion battery modules under different triggering methods
Trigger method determines which failure mode the test envelopes — the DVP row must record the hazard signature being maximized, not just the method used.
Journal of Energy Storage, May 2026. Tier 3 input — informs trigger selection for airworthiness verification but does not prescribe it.
Non-Governing Technical Evidence
A novel pressure compensated structure of lithium-ion battery pack for deep-sea autonomous underwater vehicle
The oil medium couples pressure management and thermal management in one physical element — testing them independently leaves joint behavior at operating depth uncharacterized.
ABS section 10/11.5.6 requires pressure testing but specifies no margin, ramp rate, hold time, or SOC condition.
Non-Governing Technical Evidence
The effects of different trigger methods on thermal runaway propagation in a 6.6 kWh lithium-ion pouch-cell battery module
Four triggers on the same module yielded qualitatively different results — full propagation under one method, no propagation under another.
Corroborates on a different module that trigger-method variation can determine whether propagation occurs, not merely how fast.
Non-Governing Technical Evidence
Review of pressure compensated immersion battery systems for deep-sea power applications
Selection between pressure-tolerant and pressure-compensated designs varies with depth profile and mission — a DVP must document the rationale explicitly.
Applied Energy, June 2026. Tier 3 review contextualizing subsea pack architecture decisions where settled standards guidance does not yet exist.
