IPC record
Identity and application.
The reviewed catalog row establishes the part identity and its location in the combined Hawker IPC. It does not establish the condition of a particular unit or approve that unit for installation.
| Part number | 103278-18verified |
|---|---|
| Preferred name | Cabin air-pressure valveverified |
| IPC nomenclature | Valve assembly, cabin air pressure, SB21-3621verified |
| System | Air conditioning and pressurizationverified |
| Primary ATA chapter | 21verified |
| Lookup variants | 10327818, 103278 18verified |
| Aircraft and publication scope | Effectivity | Figure / item | Qty | Review |
|---|---|---|---|---|
| Hawker 800XP, 850XP, and 900XP with kit 140-9004 publication scope | 8266-8277,8279-8279,8283-8284 as printed in the IPC export | 21-30-05-10 / 15 | 1 | verified |
| Hawker 800XP, 850XP, and 900XP with kit 140-9004 publication scope | 8278-8278,8280-8282,8285-8400,8402-8420,8422-8433,8589-8589,8599-8599,8617-8617,8619-8619 as printed in the IPC export | 21-30-05-10B / 90 | 1 | verified |
Cross-reference check
Relationships and limits.
- Both rows identify the -18 valve with SB21-3621 language.
- Both rows print quantity 1 and CMM 21-30-56.
- The reviewed IPC does not print a universal replacement statement from either -13S record to -18.
SB21-3621 wording alone is not enough to approve an installation. Confirm the aircraft serial, installed position, accomplished bulletin status, and current approved effectivity.
Mechanic's lookup notes
Common questions about 103278-18.
Is 103278-18 the SB21-3621 valve record?
Yes. Both reviewed -18 rows carry SB21-3621 wording, but the aircraft serial and accomplished configuration still need verification.
Does 103278-18 replace every 103278-13 valve?
The reviewed IPC does not print that blanket relationship. It lists separate S1, S2, and -18 configuration rows.
What quantity is printed for 103278-18?
Both figure rows print quantity 1. They cover different serial groups and should not be added together.
Long-form context
Technical guides that use this record.
Technical sources
Hawker 800XP, 850XP and 900XP Illustrated Parts CatalogTextron Aviation
- Document
- IPC-800XP
- Revision
- A0
- Published
- 2026-02-05
- Supports
- Part identities, nomenclature, figure and item references, quantity, effectivity, and relationship language as printed in the supplied IPC export.
Purchase or request quotes
Open a supplier or RFQ source below. Confirm effectivity, traceability, certification, condition, price, and current availability directly with the source.
- Air Power 103278-18Distributor
Link checked 2026-08-21 | Exact-number product page; verify current availability, condition, and release
- Allaero 103278-13 family repair pageRepair or overhaul
Link checked 2026-08-21 | Lists 103278-18 inventory and family repair capability
- AVGroup surplus inventorySurplus or marketplace
Link checked 2026-08-21 | Inventory document lists 103278-18 as an outflow valve; confirm present stock