# 1194A

Date: November 10, 2008 (M)

**SB 1194A supersedes SB 1194 in it’s entirety. SB 1194A includes an additional inspection requirement**

**(and corrective action, if required) for door mechanism clearances and adds Table 4.**

**SUBJECT :**  **PERIODIC REPLACEMENT OF NOSE BAGGAGE**

**DOOR COMPONENTS**

**MODELS AFFECTED: SERIAL NUMBERS AFFECTED:** 

PA-23-250 Aztec 27-2000 through 27-4916; 27-7304917 through 27-

7554168; 27-7654001 through 27-8154030

PA-E23-250 Aztec 27-2505 through 27-4916; 27-7304917 through 27-

7554168

PA-31 Navajo 31-2 through 31-900; 31-7300901 through 31-

8312019

PA-31-300 Navajo 31-2 through 31-900; 31-7300901 through 31-

8312019

PA-31-325 Navajo 31-7400990; 31-7512001 through 31-8312019

PA-31-350 Chieftain & T-1020 31-5001 through 31-5004; 31-7305005 through 31-

8553002

PA-31P Navajo 31P-1 through 31P-80; 31P-7300110 through 31P7730012

PA-31P-350 Mojave 31P-8414001 through 31P-8414050

PA-31T Cheyenne/Cheyenne II 31T-7400002 through 31T-8120104

PA-31T1 Cheyenne I/IA 31T-7804001 through 31T-8104073; 31T-8104101;

31T-8304001 through 31T-8304003; 31T-1104004

through 31T-1104017

PA-31T2 Cheyenne IIXL 31T-8166001 through 31T-8166076; 31T-1166001

through 31T-1166008

PA-31T3 Cheyenne T-1040 31T-8275001 through 31T-8475001; 31T-5575001

PA-42 Cheyenne III 42-7800001 through 42-8001106

PA-42-720 Cheyenne IIIA 42-8301001; 42-8301002; 42-5501003 through 42-

5501060 (except 42-5201024; 42-5501028; 42-

5501032; 42-5501034 through 42-5501038)

PA-42-1000 Cheyenne 400LS 42-5527002 through 42-5527044

**COMPLIANCE TIME:**  **PART I – REPLACEMENT:** Initial compliance to coincide with the next regularly

scheduled maintenance event, but not to exceed the next one hundred (100)

hours time in service. Thereafter, recurring inspections and replacement of lifelimited parts, as identified in this Service Bulletin and listed in Tables 1, 2, 3, and

4, shall occur at each one thousand (1,000) hours time in service.

**PART II – LUBRICATION AND INSPECTION:** At each one hundred (100) hours

time in service, starting from completion of **Part I** of this Service Bulletin. **Piper Aircraft, Inc.**

2926 Piper Drive

Vero Beach, Florida, U.S.A. 32960

(OVER)

ATA: 5230

# SERVICE BULLETIN NO. 1194A

**PAGE 2 OF 17**

**APPR O**  **V AL:**  The technical content of this Service Bulletin has been shown to comply with the

applicable Federal Aviation Regulations and is FAA approved.

**PURPOSE:** There have been field reports of nose baggage doors that have not been

properly latched or locked securely due to undetected wear. Left uncorrected,

this could lead to the inadvertent opening of the nose baggage door during flight,

which could aversely affect the flight characteristics of the airplane.

As delivered from the factory (and when in compliance with SB 604A, as

applicable), the door latching mechanism and lock assembly provides a safe,

reliable means of retaining the nose baggage door closed during flight.

Investigation has revealed several common aging-fleet related conditions that

can impair the integrity of the door latching mechanism and lock assembly.

These identified conditions are: worn/non-conforming key locks, worn/corroded

clevis pins, bent/deformed/non-conforming baggage door brackets, and

damaged/corroded door locking springs.

This Service Bulletin provides for the mandatory recurring inspection of the door

latching mechanism and lock assembly, and establishes a life-limit on safetycritical door components.

**INSTR UCTIONS:** 

Refer to the appropriate Piper Illustrated Parts Catalog, Maintenance Manual, and Figure 1 of this Service

Bulletin while performing the operations described below.

Note: Some Parts Catalogs and Maintenance Manuals will use the term “forward baggage door” in

place of “nose baggage door”.

**PART I**

1. Unlock nose baggage door, and lift door to the open position. Verify condition and function of nose baggage

door electrical switches, as applicable. With electrical power applied to aircraft, verify that the cockpit

annunciator light associated with the nose baggage door position functions properly, as explained in the

appropriate flight manual. Verify proper functioning of nose baggage compartment interior light.

2. Remove nose baggage door from aircraft per Maintenance Manual instructions. Remove and discard existing

clevis pins from the upper forward and aft door hinges.

3. Remove inner door cover; retain screws and cover for reinstallation. Examine door cover and door

mechanical components for any visible damage, corrosion and wear; repair or replace on condition.

4. Verify compliance with SB 604A, if applicable. The BAGGAGE DOOR HANDLE BRACKET, Piper part

number 28467-003 must be installed over the BAGGAGE DOOR HANDLE BRACKET, Piper part

number 30580-000.

• The correct part is Piper part number 28467-003, and is made of steel. If the 28467-003 bracket is

not installed, then the aircraft is not in compliance with SB 604A.

• If there is a bracket in place, but the part number is 28467-002, then the aircraft is not in compliance

with SB 604A. Incorrect part number 28467-002 is made of aluminum. For confirmation, place a

magnet against the 28467 series part that is installed. A magnet will stick to the correct part number

28467-003, but will not stick to the incorrect part number 28467-002.

# SERVICE BULLETIN NO. 1194A PAGE 3 OF 17

**INSTR UCTIONS:**  (Continued)

5. With the 28467-003 BAGGAGE DOOR HANDLE BRACKET installed, verify that a .005 inch minimum gap

exists between this part and the 30852-000 PLATE ASSEMBLY – BAGGAGE DOOR LOCK GUIDE, as

shown in Figure 5. This positive clearance must exist during the entire latching and locking sequence.

• If these two parts maintain a clearance of .005 inches or more during the entire door latching and locking

sequence, no rework is required.

• If these two parts cannot maintain a clearance of .005 inches or more during the entire door latching and

locking sequence as currently installed, or if contact occurs between these parts, relocate the factoryinstalled 30852-000 PLATE ASSEMBLY – BAGGAGE DOOR LOCK GUIDE as follows:

Remove upper screw, and loosen lower screw. Rotate the 30852-000 PLATE ASSEMBLY – BAGGAGE

DOOR LOCK GUIDE as needed to achieve clearance, as shown in figure 6. With a positive clearance of

at least .005 inches established, verify proper operation of latching and locking mechanism. Mark the

door skin with the new location of the upper threaded insert in the 30852-000 PLATE ASSEMBLY –

BAGGAGE DOOR LOCK GUIDE. Verify that the spacing between this new proposed fastener location

and the original fastener location is at least .50 inches. Drill a .141 to .147 inch diameter hole in the door

skin, to match the new location of the upper threaded insert in the 30852-000 PLATE ASSEMBLY –

BAGGAGE DOOR LOCK GUIDE. Plug the original open hole with a driven rivet of suitable size,

MS20470AD or equivalent, with manufactured head placed on the outboard side of the door. Tighten both

screws common to the 30852-000 PLATE ASSEMBLY – BAGGAGE DOOR LOCK GUIDE. If needed, it

is permissible to remove .05 inches of material from the 30852-000 PLATE ASSEMBLY – BAGGAGE

DOOR LOCK GUIDE to achieve the required operating clearance, provided that the reworked edge is

smooth, free of scratches or burrs, blended into adjacent surfaces, and painted with suitable primer.

6. Remove and discard springs common to BAGGAGE DOOR LATCH TUBE ASSEMBLY, as applicable. Refer

to appropriate Illustrated Parts Catalog and Table 1, 2, 3, or 4 for applicability and location. (Springs not

shown in Figure 1.)

7. Remove and discard existing clevis pins that join the BAGGAGE DOOR LATCH TUBE ASSEMBLY to the

forward and aft BAGGAGE DOOR LATCH ASSEMBLY.

8. Remove and discard existing clevis pin common to the BAGGAGE DOOR LATCH TUBE ASSEMBLY and the

FORWARD BAGGAGE DOOR HANDLE.

Note: Some Aircraft may have a ROLL PIN installed at this location. If roll pin is present carefully drive out roll

pin and replace it with hardware specified in this service bulletin.

9. Remove and discard existing PINS (2 places) common to the BAGGAGE DOOR HANDLE BRACKET and the

FORWARD BAGGAGE DOOR HANDLE.

10. Inspect the BAGGAGE DOOR HANDLE BRACKET, Piper part number 28467-003 for damage and replace

on condition. Verify that the 28467-003 conforms to critical dimensions shown in Figure 2.

11. Remove and discard existing FORWARD BAGGAGE DOOR LOCK. Order and install KIT – LOCK

ASSEMBLY, Piper part number 88409-002, one each.

Note: Piper part number 88409-002 provides complete parts and instructions to assemble a direct replacement

key lock for the nose baggage door. Make sure a key is inserted into the lock at all times when the lock is

being reworked per the kit instructions, because the existence of the key in the lock captures and retains

numerous small internal parts when the outer lock cylinder is removed. Disassembly of the lock without

the key inserted could allow these small parts to fall free from the lock and become lost.

# SERVICE BULLETIN NO. 1194A

**PAGE 4 OF 17**

**INSTR UCTIONS:**  (Continued)

12. Reassemble all components except door cover, and reinstall nose baggage door on aircraft using new

components specified in Table 1, 2, 3, and/or 4, as applicable. Verify proper adjustment of the forward and aft

BAGGAGE DOOR LATCH ASSEMBLY per Maintenance Manual instructions. Lubricate moving parts with

general purpose, low temperature lubricating oil conforming to MIL-PRF-7870C or equivalent. Lubricate key

lock with PTFE dry lubricant such as part number MS-122DF (aerosol spray can, which can be purchased

from Miller Stephenson Chemical Company) or equivalent.

Note: The liquid carrier for PTFE dry lubricant (which evaporates on contact) will attack any acrylic based

plastic (Lucite), polycarbonate (Lexan), polystyrene and its copolymer (ABS), and cellulose acetate.

Therefore, avoid contact with the door cover or any other plastic parts while the PTFE dry film lubricant is

in the (initial) liquid form.

13. Reinstall door cover.

14 For initial (first-time) compliance with Part I of this Service Bulletin, follow instruction 14A. After initial

compliance with Part I of this Service Bulletin, follow instruction 14B.

A For first-time compliance with Part I of this Service Bulletin: Order and install KIT – PLACARD – NOSE

BAGGAGE DOOR, Piper part number 88451-002, which includes parts and instructions for installing a

P/N 100700-079 Placard on the Nose Baggage Door Handle.

B After the first-time compliance with Part I of this Service Bulletin has been accomplished: Inspect the P/N

100700-079 Placard, which is installed directly above the Nose Baggage Door Handle, to verify security

and legibility, and replace on condition by ordering and installing KIT – PLACARD – NOSE BAGGAGE

DOOR, Piper part number 88451-002.

15. Place a copy of Page 11 of this Service Bulletin in the aircraft’s appropriate Flight Manual (AFM or POH),

where it shall remain until the content of the Service Bulletin included at the next revision to the flight manual.

16. Make a logbook entry indicating compliance with **Part 1** of this Service Bulletin.

**PART II**

1. At each 100 hours time in service, remove the inner door cover of the nose baggage door. Inspect all

door latching and locking components for condition, corrosion and rigging. Verify that the key can only

be removed from the key lock when the key is in the locked position. Lubricate components as

described in this Service Bulletin, and reinstall cover.

2. Verify that the aircraft’s flight manual (AFM or POH, as appropriate) includes either one of the following:

• A copy of Page 11 of this Service Bulletin, as directed in **Part I** , Step 14.

• A revision has been made to the Flight Manual, which incorporates the content of Page 11 of this

Service Bulletin.

3. Inspect the P/N 100700-079 Placard, which is installed directly above the Nose Baggage Door

Handle, to verify security and legibility, and replace on condition by ordering and installing KIT –

PLACARD – NOSE BAGGAGE DOOR, Piper part number 88451-002.

4. Make a logbook entry indicating compliance with **Part II** of this Service Bulletin.

# SERVICE BULLETIN NO. 1194A PAGE 5 OF 17**S TEP 7** **S TEP 7** BAGGAGE DOORLATCH ASSY**S TEP 11** KIT - LOCK ASSY88409-002BAGGAGE DOORLATCH TUBE ASSY**S TEP 4 & 10** BAGGAGE DOORHANDLE BRACKET28467-003BAGGAGE DOORHANDLE BRACKET**S TEP 9** **S TEP** **8**INSTALL CLEVISPINHEAD UPBAGGAGE DOORLATCH ASSY.INSIDE VIEW OF TYPICAL FORWARD BAGGAGE DOOR LATCHREFER TO TABLES1, 2,3OR 4 FOR MODEL -SPECIFIC HARDWAREFOR ALL CLEVISPINSTHAT CALL OUT AN AN960 WASHER, PLACE WASHER UNDER COTTER PIN.**FIGURE 1 S** **TEP 9**INSTALL CLEVISPINHEAD UP

# SERVICE BULLETIN NO. 1194A

**PAGE 6 OF 17**

# SERVICE BULLETIN NO. 1194A PAGE 7 OF 17

**MA TERIAL REQ**  **UIRED: Ste** **p QTY** **Pi p** **er Code # Nomenclature Installed Location**2(required)*424-182 PIN -(MS20392-2C27)2(required)*407-564 WASHER -(AN960-10)2(required)*424-051 COTTER PIN -(MS24665-132)4, 10 1 (on condition) 28467-003 BAGGAGE DOOR HANDLE BRACKET see Figure 162 (required)*487-383 SPRING (83302-047)attaches to forward & aft ends of BAGGAGE DOORLATCH TUBE ASSEMBLY2 (required)*424-177 PIN - Clevis, Tube Assembly (MS20392-2C17)2(required)*407-584 WASHER -(AN960-10L)2(required)*424-051 COTTER PIN -(MS24665-132)1(required)*424-148 PIN -(MS20392-1C23)1(required)*407-581 WASHER -(AN960-4L)1(required)*424-052 COTTER PIN -(MS24665-134)1(required)*424-186 PIN - Door handle hinge(MS20392-2C35)2(on condition)19513-053 WASHER - DOOR HANDLE SPACER1(required)*407-584 WASHER -(AN960-10L)1(required)*424-051 COTTER PIN -(MS24665-132)1(required)*487-458 SPRING(83302-067)1(required)*424-145 PIN -(MS20392-1C17)1(required)*407-562 WASHER -(AN960-6)1(required)*424-051 COTTER PIN -(MS24665-132)111 (required)*88409-002 KIT – LOCK ASSEMBLYreplaces existing FORWARD BAGGAGE DOORLOCK14 1 (required) 88451-002 KIT - PLACARD NOSE BAGGAGE DOORrequired for initial compliance with this ServiceBulletin only. For subsequent compliance intervals,inspect and replace on condition.*******LIFE-LIMITED PART, REPLACE EACH 1000 HOURS TIME IN SERVICE. VERIFY COMPLIANCE WITH PIPER SERVICE BULLETIN 604A AS APPLICABLE.** 2789pins NOSE BAGGAGE DOOR to airframe, throughthe gooseneck hinges.pins the BAGGAGE DOOR LATCH TUBEASSEMBLY to the forward and aft BAGGAGEDOOR LATCH ASSEMBLYpins the FORWARD BAGGAGE DOOR HANDLE tothe BAGGAGE DOOR HANDLE BRACKETpins the FORWARD BAGGAGE DOOR HANDLE tothe BAGGAGE DOOR LATCH ASSEMBLY**TABLE 1**EFFECTIVITY: PA-23-250, and PA-E23-250**Ste p** **QTY Pi** **p er Code # Nomenclature Installed Location** 1(required)*****424-182 PIN -(MS20392-2C29), install on**fwd**side1(required)*****424-183 PIN -(MS20392-2C31), install on**aft**side2(required)*****407-564 WASHER -(AN960-10)2(required)*****424-051 COTTER PIN -(MS24665-132)4, 10 1 (on condition) 28467-003 BAGGAGE DOOR HANDLE BRACKET see Figure 12 (required)*****487-316 SPRING (83302-023)attaches to forward & aft ends of BAGGAGE DOORLATCH TUBE ASSEMBLY1 (required)*****487-371 SPRING (14635-003)attaches to center of BAGGAGE DOOR LATCHTUBE ASSEMBLY2(required)*****424-176 PIN - Clevis, Tube Assembly (MS20392-2C15)2(required)*****407-584 WASHER -(AN960-10L)2(required)*****424-051 COTTER PIN -(MS24665-132)1(required)*****424-148 PIN -(MS20392-1C23)1(required)*****407-581 WASHER -(AN960-4L)1(required)*****424-052 COTTER PIN -(MS24665-134)1(required)*****424-186 PIN - Door handle hinge(MS20392-2C35)2(on condition)19513-053 WASHER - DOOR HANDLE SPACER1(required)*****407-584 WASHER -(AN960-10L)1(required)*****424-051 COTTER PIN -(MS24665-132)1(required)*****487-458 SPRING(83302-067)1(required)*****424-145 PIN -(MS20392-1C17)1(required)*****407-562 WASHER -(AN960-6)1(required)*****424-051 COTTER PIN -(MS24665-132)111 (required)*****88409-002 KIT – LOCK ASSEMBLYreplaces existing FORWARD BAGGAGE DOORLOCK14 1 (required) 88451-002 KIT - PLACARD NOSE BAGGAGE DOORrequired for initial compliance with this ServiceBulletin only. For subsequent compliance intervals,inspect and replace on condition.pins the FORWARD BAGGAGE DOOR HANDLE tothe BAGGAGE DOOR HANDLE BRACKETpins the FORWARD BAGGAGE DOOR HANDLE tothe BAGGAGE DOOR LATCH ASSEMBLY9*LIFE-LIMITED PART, REPLACE EACH 1000 HOURS TIME IN SERVICE.**VERIFY COMPLIANCE WITH PIPER SERVICE BULLETIN 604A AS APPLICABLE.**278pins NOSE BAGGAGE DOOR to airframe, throughthe gooseneck hinges.pins the BAGGAGE DOOR LATCH TUBEASSEMBLY to the forward and aft BAGGAGEDOOR LATCH ASSEMBLY6**TABLE 2**EFFECTIVITY: PA-31, PA-31-300, PA-31-325, and PA-31-350 

# SERVICE BULLETIN NO. 1194A

**PAGE 8 OF 17**

**MA TERIAL REQ**  **UIRED:**

# SERVICE BULLETIN NO. 1194A PAGE 9 OF 17

**MA TERIAL REQ**  **UIRED: Ste** **p QTY** **Pi p** **er Code # Nomenclature Installed Location**2(required)*****424-188 PIN -(MS20392-2C41)2(required)*****407-564 WASHER -(AN960-10)2(required)*****424-051 COTTER PIN -(MS24665-132)4, 10 1 (on condition) 28467-003 BAGGAGE DOOR HANDLE BRACKET see Figure 12 (required)*****424-176 PIN - Clevis, Tube Assembly (MS20392-2C15)2(required)*****407-584 WASHER -(AN960-10L)2(required)*****424-051 COTTER PIN -(MS24665-132)1(required)*****424-148 PIN -(MS20392-1C23)1(required)*****407-581 WASHER -(AN960-4L)1(required)*****424-052 COTTER PIN -(MS24665-134)1(required)*****424-186 PIN - Door handle hinge(MS20392-2C35)2(on condition)19513-053 WASHER - DOOR HANDLE SPACER1(required)*****407-584 WASHER -(AN960-10L)1(required)*****424-051 COTTER PIN -(MS24665-132)1(required)*****487-458 SPRING(83302-67)1(required)*****424-145 PIN -(MS20392-1C17)1(required)*****407-562 WASHER -(AN960-6)1(required)*****424-051 COTTER PIN -(MS24665-132)111 (required)*****88409-002 KIT – LOCK ASSEMBLYreplaces existing FORWARD BAGGAGE DOORLOCK14 1 (required) 88451-002 KIT - PLACARD NOSE BAGGAGE DOORrequired for initial compliance with this ServiceBulletin only. For subsequent compliance intervals,inspect andreplace oncondition.pins the FORWARD BAGGAGE DOOR HANDLE tothe BAGGAGE DOOR LATCH ASSEMBLY***LIFE-LIMITED PART ,** **REPLACE EACH 1000 HOURS TIME IN SERVICE**.**VERIFY COMPLIANCE WITH PIPER SERVICE BULLETIN 604A AS APPLICABLE.**pins NOSE BAGGAGE DOOR to airframe, throughthe gooseneck hinges.pins the BAGGAGE DOOR LATCH TUBEASSEMBLY to the forward and aft BAGGAGEDOOR LATCH ASSEMBLYpins the FORWARD BAGGAGE DOOR HANDLE tothe BAGGAGE DOOR HANDLE BRACKET2789**TABLE 3**EFFECTIVITY: PA-31P, PA-31P-350, PA-31T, PA-31T1, PA-31T2, PA-31T3, PA-42, PA42-720, and PA-42-1000******

# SERVICE BULLETIN NO. 1194A

**PAGE 10 OF 17 Ste** **p QTY** **Pi p** **er Code # Nomenclature Installed Location**2(required)*524-160 PIN -(MS20392-2C45)2(required)*407-564 WASHER -(AN960-10)2(required)*407-584 WASHER -(AN960-10L)2(required)*424-051 COTTER PIN -(MS24665-132)4, 10 1 (on condition) 28467-003 BAGGAGE DOOR HANDLE BRACKET see Figure 162 (required)*487-383 SPRING (83302-047)attaches to forward & aft ends of BAGGAGE DOORLATCH TUBE ASSEMBLY2 (required)*424-177 PIN - Clevis, Tube Assembly (MS20392-2C17)2(required)*407-584 WASHER -(AN960-10L)2(required)*424-051 COTTER PIN -(MS24665-132)1(required)*424-148 PIN -(MS20392-1C23)1(required)*407-581 WASHER -(AN960-4L)1(required)*424-052 COTTER PIN -(MS24665-134)1(required)*424-186 PIN - Door handle hinge(MS20392-2C35)2(on condition)19513-053 WASHER - DOOR HANDLE SPACER1(required)*407-584 WASHER -(AN960-10L)1(required)*424-051 COTTER PIN -(MS24665-132)1(required)*487-458 SPRING(83302-067)1(required)*424-145 PIN -(MS20392-1C17)1(required)*407-562 WASHER -(AN960-6)1(required)*424-051 COTTER PIN -(MS24665-132)111 (required)*88409-002 KIT – LOCK ASSEMBLY replaces existing AFT BAGGAGE DOOR LOCK14 1 (required) 88451-002 KIT - PLACARD NOSE BAGGAGE DOORrequired for initial compliance with this ServiceBulletin only. For subsequent compliance intervals,inspect and replace on condition.********FOR MODEL PA-42-1000, TABLES 3 AND 4 ARE BOTH APPLICABLE.*********LIFE-LIMITED PART, REPLACE EACH 1000 HOURS TIME IN SERVICE. VERIFY COMPLIANCE WITH PIPER SERVICE BULLETIN 604A AS APPLICABLE.** pins NOSE BAGGAGE DOOR to airframe, throughthe gooseneck hinges.pins the BAGGAGE DOOR LATCH TUBEASSEMBLY to the forward and aft BAGGAGEDOOR LATCH ASSEMBLYpins the BAGGAGE DOOR HANDLE to theBAGGAGE DOOR HANDLE BRACKET2789pins the BAGGAGE DOOR HANDLE to theBAGGAGE DOOR LATCH ASSEMBLY**TABLE 4**EFFECTIVITY: PA-42-1000******AFT BAGGAGE DOOR LOCATION

# SERVICE BULLETIN NO. 1194A PAGE 11 OF 17

**Nose Baggage Door Operational Procedure**

A copy of this page shall remain in the aircraft’s appropriate flight manual (AFM or POH), until this content can be

included at the next revision to the flight manual.



# 1. CLO S E DOOR FULLY AGAIN S T DOOR FRAME

2. PRE SS DOOR HANDLE FLU S H WITH S KIN, AND

ROTATE KEY INTO LOCKED PO S ITION

3 . REMOVE KEY

4. PU S H ON FORWARD END OF DOOR HANDLE, TO

CONFIRM THAT HANDLE I S LOCKED AND S ECURE 

# CLO S E AND LOCK

NO S E BAGGAGE DOOR

BEFORE FLIGHT 100700-079 AR

# SERVICE BULLETIN NO. 1194A

**PAGE 12 OF 17**



# Principle of Operation

**Nose Baggage Door latching and locking mechanism**

Field reports indicate that mechanics and operators could benefit from an understanding of how the latching and

locking components work together to secure the Nose Baggage Door during flight.

Piper Service Bulletin 604A states in part:

... it is possible to close the door and turn the lock to the locked position without the lock tang [also known

as locking cam] actually engaging the door handle. As a result, the door would not be properly secured

and could possibly come open in flight...

Prior to implementation of SB604A, the described condition could conceivably occur if the key lock becomes

sufficiently worn so as to allow the locking cam to fit behind the handle in the locked position, with the handle

flush to the outer surface of the fuselage. This scenario would appear visually as a locked and secure

configuration, when in fact the locking cam is not engaged in the Door Handle slot.

Note: The cockpit ann unciator light associated with the nose baggage door is controlled by a framemounted switch that makes contact with the door when the door closes. There is no interaction

between the annunciator light circuit and the door mechanisms for latching and locking. Thus, an

annunciator light that is turned off confirms only that the door is in the closed position, and does

not confirm that the door is latched or locked.

This concern is addressed by installing a kit, Piper part number 763-923 or 763-922 (see Piper Service Bulletin

604A for applicability), which (in part) calls for installation of the 28467-003 Baggage Door Handle Bracket

(hereafter identified as “28467-003 Bracket”). Affected aircraft manufactured after publication of Service Bulletin

604A will have this bracket (and associated parts) installed at the factory.

Note: Refer to Figures 3 and 4 for a visual depiction of the descriptions that follow.

The 28467-003 Bracket is hinged at the forward end with a clevis pin common to the Door Handle and the

30580-000 Baggage Door Handle Bracket, and features three right-angle prongs at the aft (key lock) end. In the

locked position (i.e., prepared for flight), the middle prong exerts contact pressure against the Door Handle (due

to compression force from the coil spring which is mounted on the back of the 28467-003 Bracket), holding the

adjacent upper and lower prongs inboard, clear from contact with the locking cam.

Normal opening sequence is as follows: A key is inserted into the key lock and turned, rotating the locking cam

out of the slot in the Door Handle. When the key is rotated beyond approximately 40 degrees from the locked

position, the coil spring acts to push the aft end of both the 28467-003 Bracket and the Door Handle outboard

(open), by a distance of approximately one quarter (1/4) inch. With the 28467-003 Bracket in this outboard

position, the upper prong now blocks the return path of the locking cam, preventing the locking cam from rotating

back into the locked position unless the handle is pushed back into the fully latched position (thereby preventing

the condition described in SB604A, noted above).

As part of the normal door closing sequence, the aft end (nearest the key lock) of the Door Handle is pressed

flush with the surface of the outer door. This action causes contact pressure between the Door Handle and the

middle prong of the 28467-003 Baggage Door Handle Bracket. Both parts rotate together on a common hinge

line, compressing the spring, and moving the upper prong inboard, out of the path of the locking cam.

With the Door Handle held flush as described above, the key may then be turned to the locked position, engaging

the locking cam into the slot in the Door Handle. With the locking cam in the locked position, removal of the key

prevents rotation of the locking cam, which in turn prevents the door handle from opening.

# SERVICE BULLETIN NO. 1194A PAGE 13 OF 17



# Open Position

**Figure 3**

**Door Latch Mechanism Latched and Locked Position**  **Top**

**View**

**Backside**

**View 3 - D** 

**View**

# SERVICE BULLETIN NO. 1194A

**PAGE 14 OF 17**



# Figure 4

**Door Latch Mechanism**

**Close-up View Open Position**  **Latched and Locked Position 3 - D View** 

**Close-up**

**Top View**

**Close-up**

**Backside View**

**Close-up**

# SERVICE BULLETIN NO. 1194A PAGE 15 OF 1728467-003BAGGAGE DOOR HANDLE BRACKET30852-000 PLATE ASSEMBLY -BAGGAGE DOOR LOCK GUIDEKEY LOCK CAMTHERESHALL BE A MINIMUM CLEARANCE OF .005 INCHESBETWEEN 28467-003BAGGAGE DOOR HANDLE BRACKETAND30852-000 PLATE ASSY-BAGGAGE DOOR LOCK GUIDE.VIEW LOOKING OUTBDUP



# Figure 5

**CORRECT INSTALLATION SHOWING POSITIVE**

**CLEARANCE BETWEEN 28467-003 & 30852-000**

# SERVICE BULLETIN NO. 1194A

**PAGE 16 OF 17**VIEW LOOKING OUTBD28467-003BAGGAGE DOOR HANDLEBRACKET30852-000PLATE ASSEMBLY -BAGGAGE DOOR LOCK GUIDENEW LOCATIONKEY LOCK CAMDRILL .141 TO .147 INCH DIAMETERHOLE IN DOORSKIN TO MATCHNEW HOLE LOCATION OF30852-000PLUG EXISTING HOLE LOCATION INDOORSKIN WITH RIVET0.50 INCHMINIMUMMISLOCATED30852-000 PLATEASSEMBLY - BAGGAGE DOOR LOCK GUIDEORIGINAL LOCATIONUPTHERESHALL BE A MINIMUM CLEARANCE OF .005 INCHESBETWEEN 28467-003BAGGAGE DOOR HANDLE BRACKETAND30852-000 PLATE ASSY-BAGGAGE DOOR LOCK GUIDE.



# FIGURE 6

**RELOCATION OF 30852-000, IF**

**REQUIRED TO ACHIEVE CLEARANCE**

**FROM 28467-003**

# SERVICE BULLETIN NO. 1194A PAGE 17 OF 17

**MA TERIAL REQ**  **UIRED:** See Tables 1, 2, 3 or 4 for the part numbers applicable to aircraft models.

**A**

**V**

**AILABILITY OF P AR**  **TS:** Your Piper Service Facility.

**EFFECTIVITY D A**  **TE:** This Service Bulletin is effective upon receipt.

**SUMMAR Y**  **:** Please contact your Factory Authorized Piper Service Facility to make

arrangements for compliance with this Service Bulletin in accordance with the

compliance time indicated.

**NO TE:**  If you are no longer in possession of this aircraft, please forward this information to the present

owner/operator and notify the factory of address/ownership corrections. Changes should include aircraft model,

serial number, current owner's name and address.

Corrections and/or changes should be directed to:

PIPER AIRCRAFT, INC.

Attn: Customer Service

2926 Piper Drive

Vero Beach, FL 32960