Quick Answers
What does FAA AD 2026-15-13 require for A320neo operators?
FAA AD 2026-15-13, effective September 2, 2026, supersedes AD 2025-16-12 and requires repetitive replacement of affected HPV butterfly seal retention clips on all A319neo, A320neo, and A321neo/NX/NY variants. The retained actions — AFM revision, MEL revision, and installation prohibition — remain in force. An optional terminating action (full HPV replacement) costs $5,520 per aircraft.
Is the A320neo HPV butterfly seal clip AD the same as the A220 HPV Emergency AD?
No. FAA AD 2026-15-13 covers the Airbus SAS A320neo family’s HPV butterfly seal retention clips — requiring repetitive clip replacement. Emergency AD 2026-13-52 covers the Airbus Canada A220’s HPV butterfly clips — imposing dispatch prohibitions. Different component, different aircraft, different manufacturer, different required action.
Quick Compliance Summary
| Regulatory body | Federal Aviation Administration (FAA) |
| AD number | 2026-15-13 — Amendment 39-23425 |
| Docket | FAA-2026-3874 |
| Aircraft affected | All Airbus A319neo, A320neo, A321neo/NX/NY variants |
| Issue | HPV butterfly seal retention clip rupture — clips no longer retain the butterfly seals in the butterfly groove |
| Required action | Retained actions from AD 2025-16-12 (AFM revision, MEL revision, installation prohibition). New: repetitive replacement of each affected HPV clip |
| Optional terminating action | Replace each affected HPV — $5,520 per aircraft |
| Compliance deadline | September 2, 2026 |
| US fleet affected | 554 airplanes |
| Supersedes | AD 2025-16-12 (effective August 29, 2025) |
| Source | Federal Register Vol. 91, No. 146, July 29, 2026 — FR Doc 2026-15308 |
Who Should Read This
This update is directly relevant to:
- Continuing Airworthiness Managers (CAMs) for A320neo family fleets
- Directors of Maintenance
- MEL administrators and dispatch teams
- MRO Planning Teams scheduling A320neo family maintenance
- Spare parts and inventory managers handling HPV components
This AD applies only to the NEO family. The A318, A319ceo, A320ceo, and A321ceo are not in scope.
If your fleet includes any A319neo, A320neo, or A321neo/NX/NY variant, this AD requires action before September 2, 2026.
At a Glance
| Item | Details |
|---|---|
| AD Number | 2026-15-13 |
| Amendment | 39-23425 |
| Docket | FAA-2026-3874 |
| ATA Code | 36 — Pneumatic |
| Aircraft | A319neo (-151N, -153N, -171N, -173N); A320neo (-251N, -252N, -253N, -271N, -272N, -273N); A321neo/NX/NY (-251N, -252N, -253N, -271N, -272N, -251NX, -252NX, -253NX, -271NX, -272NX, -253NY, -271NY) |
| Effective Date | September 2, 2026 |
| Supersedes | AD 2025-16-12 (effective August 29, 2025) |
| Originating authority | EASA AD 2025-0096, April 28, 2025 |
| US fleet affected | 554 airplanes |
| New action cost | $808 per aircraft (5 work-hours + $383 parts) |
| Terminating action cost | $5,520 per aircraft (32 work-hours + $2,800 parts) |
| ALPA support | Supported without change |
What Changed
The FAA published AD 2026-15-13 on July 29, 2026. It is effective September 2, 2026.
This AD supersedes AD 2025-16-12, which was issued August 14, 2025, and became effective August 29, 2025.
AD 2025-16-12 required three things: revising the AFM, revising the MEL, and prohibiting installation of affected parts. It also offered an optional terminating action — replacing each affected HPV.
Since that AD was issued, the FAA determined that additional action is necessary. Repetitive replacement of the HPV clips is now required. The original three actions from AD 2025-16-12 are retained. The clip replacement is new.
ALPA supported the NPRM without change. No other comments were received.
Why It Matters
Reports identified HPV butterfly seal retention clip rupture on A320neo family aircraft. When the clip ruptures, the butterfly seals are no longer retained in the butterfly groove.
Two consequences follow.
First: Internal leakage increases. This can trigger a false alert that the HPV has failed in the open condition. That drives the crew into a non-normal procedure. Repeated false alerts erode crew trust in the alert system.
Second: The ruptured clip releases foreign object debris (FOD) into the pneumatic system downstream from the HPV. That FOD can damage the engine bleed air system and the pneumatic system on the engine pylon and wing.
The ultimate unsafe condition: high pressure and temperature in the duct downstream of the pressure-regulating valve. This could lead to duct burst. Duct burst can damage multiple systems and the airframe structure. The end state is potential loss of control of the airplane.
Not the Same as the A220 HPV Butterfly Clip AD
The overlap in terminology requires a clear distinction.
FAA Emergency AD 2026-13-52 (Article 19 in the ARW series) covers the Airbus Canada A220’s HPV butterfly clips. That AD imposed dispatch prohibitions — it affected the bleed-air system in the A220’s pneumatic architecture.
This AD — 2026-15-13 — covers the Airbus SAS A320neo family’s HPV butterfly seal retention clips. Different component. Different aircraft type. Different manufacturer. Different required action.
Both involve “HPV butterfly clips.” They are not the same part, the same aircraft, or the same AD. Compliance with one does not satisfy the other.
Who Is Affected
All A319neo, A320neo, and A321neo/NX/NY variants, certificated in any category.
The full model list:
| Family | Variants |
|---|---|
| A319neo | -151N, -153N, -171N, -173N |
| A320neo | -251N, -252N, -253N, -271N, -272N, -273N |
| A321neo/NX/NY | -251N, -252N, -253N, -271N, -272N, -251NX, -252NX, -253NX, -271NX, -272NX, -253NY, -271NY |
CEO variants are not in scope. The A318, A319ceo, A320ceo, and A321ceo are not affected by this AD.
Required Action — Retained + New
Retained from AD 2025-16-12
If you have already completed these actions under AD 2025-16-12, no additional action is required for these items:
- AFM revision — revise the existing AFM as specified in EASA AD 2025-0096
- MEL revision — revise the operator’s existing FAA-approved MEL by incorporating the applicable information from the MMEL update defined in EASA AD 2025-0096
- Installation prohibition — do not install affected parts
New action in this AD
Repetitive replacement of each affected HPV clip. Comply with the replacement schedule specified in EASA AD 2025-0096. This is a repetitive action — not a one-time replacement. The clips must be replaced at the intervals defined in the EASA AD.
Optional terminating action
Replace each affected HPV entirely. This terminates both the retained actions and the new requirement for repetitive clip replacement.
Cost per aircraft for the terminating action: 32 work-hours at $85/hour = $2,720 labor + $2,800 parts = $5,520 total.
For operators with large NEO fleets, the terminating action may be more cost-effective than indefinite repetitive clip replacements — particularly on high-utilization aircraft that would reach the replacement interval frequently.
Operational Impact
554 US-registered A320neo family airplanes are affected. The compliance date is September 2, 2026 — five weeks from today.
The new action — repetitive HPV clip replacement — adds a recurring maintenance task to the A320neo family maintenance program. The cost per replacement cycle is modest ($808 per aircraft). But the repetitive nature means this task will recur on every affected aircraft at the defined interval until the optional terminating action is accomplished.
For MRO planning teams: add the HPV clip replacement to the recurring work scope for every in-scope aircraft. Track replacement intervals by tail number.
For spare parts teams: ensure sufficient HPV clip stock is available. A fleet of 554 aircraft on a repetitive replacement cycle will generate ongoing demand.
For operators weighing the terminating action: the breakeven point depends on your fleet utilization. High-cycle operators will reach the repetitive interval more frequently. Calculate the cumulative repetitive replacement cost over 3–5 years against the one-time $5,520 terminating action cost per aircraft.
Key Dates
| Event | Date |
|---|---|
| EASA AD 2025-0096 issued | April 28, 2025 |
| FAA AD 2025-16-12 effective (prior AD) | August 29, 2025 |
| NPRM published | April 29, 2026 |
| FAA AD 2026-15-13 published | July 29, 2026 |
| AD 2026-15-13 effective | September 2, 2026 |
Source Documents
- Federal Register Vol. 91, No. 146, July 29, 2026 — FR Doc 2026-15308
- Superseded: AD 2025-16-12, Amendment 39-23110 (90 FR 39102, August 14, 2025)
- EASA AD 2025-0096, April 28, 2025 — available at ad.easa.europa.eu
- AD Docket: regulations.gov, Docket No. FAA-2026-3874
- FAA contact: Frank Carreras — Frank.Carreras@faa.gov, 206-231-3539
FAQ
Does this AD apply to the A320ceo family?
No. This AD applies only to the NEO variants — A319neo, A320neo, and A321neo/NX/NY. The A318, A319ceo, A320ceo, and A321ceo are not in scope.
Is this the same as the A220 HPV butterfly clip Emergency AD?
No. Emergency AD 2026-13-52 covers the Airbus Canada A220’s HPV butterfly clips — a different component on a different aircraft type. This AD covers the HPV butterfly seal retention clips for the Airbus SAS A320neo family. They are unrelated items with different required actions.
I already complied with AD 2025-16-12. Do I need to do anything more?
Yes. The retained actions from AD 2025-16-12 do not need to be repeated. But this AD adds a new requirement: repetitive replacement of each affected HPV clip. That new action must be accomplished per the schedule in EASA AD 2025-0096.
What is the optional terminating action?
Replacing each affected HPV entirely. Once completed, both the retained actions and the repetitive clip replacement are terminated. Cost: $5,520 per aircraft.
Should I do the terminating action or the repetitive replacement?
It depends on your fleet utilization. High-cycle operators will reach the repetitive clip replacement interval more frequently. Calculate the cumulative recurring cost over your planning horizon relative to the one-time $5,520 termination action. For most high-utilization operators, the terminating action is likely more cost-effective within 2–3 years.
What happens if the clip ruptures in flight?
The ruptured clip releases FOD into the pneumatic system. This can damage the bleed air system and pneumatic components on the pylon and wing. The downstream risk: high pressure and temperature in the duct, duct burst, damage to systems or airframe, and potential loss of control.
Related Reading:
- FAA AD 2026-12-07: Boeing 787 MCP Altitude Change — CFIT and Mid-Air Collision Risk Requires MCP Replacement by July 20
- FAA AD 2026-13-16: Boeing 757 and 767 Family — 5G Canadian Airspace Requires Two-Part AFM Revision
- FAA AD 2026-13-14: Boeing 747 Classic and 400 Series — 5G Canadian Airspace Limitations: Complete the Type-Specific AD Series
- FAA AD 2026-10-14: Boeing 747 SATCOM Antenna Adapter Plate Corrosion — Repetitive Inspections Required
aviationregwatch.com publishes regulatory intelligence for aviation compliance professionals. This article is an informational summary, not legal or airworthiness advice. Consult your aircraft manufacturer, CAMO, or legal counsel for compliance decisions.